Bug 288602 – [GTK4] Blank WebView depending on the monitor it appears in

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKitGTK

[Philippe Normand]

I have a dual monitor setup, if I start MB on the left monitor, nothing is rendered. If I start it on the right monitor, rendering works... Reproducible with Ephy Canary as well.

webkit://gpu renders fine on both.

{
    "Version Information": {
        "WebKit version": "WebKitGTK 2.47.4 (291092@main)",
        "Operating system": "Linux 6.12.15-200.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Feb 18 15:24:05 UTC 2025 x86_64",
        "Desktop": "GNOME",
        "GStreamer version": "1.24.12 (build) GStreamer 1.24.12 (runtime)",
        "GTK version": "4.17.5 (build) 4.17.5 (runtime)"
    },
    "Display Information": {
        "Identifier": "2",
        "Type": "Wayland",
        "Screen geometry": "1920,0 1920x1080",
        "Screen work area": "1920,0 1920x1080",
        "Depth": "24",
        "Bits per color component": "8",
        "Font Scaling DPI": "96",
        "Screen DPI": "81.13514004658197",
        "VBlank type": "DRM",
        "VBlank refresh rate": "59Hz",
        "DRM Device": "/dev/dri/card0",
        "DRM Render Node": "/dev/dri/renderD128"
    },
    "API": "OpenGL ES 2 (libepoxy)",
    "Hardware Acceleration Information": {
        "Policy": "always",
        "WebGL enabled": "Yes",
        "2D canvas": "Accelerated",
        "Renderer": "DMABuf (Supported buffers: Hardware, Shared Memory)",
        "Buffer format": "DMA-BUF: XR24 (AMD_GFX11,64KB_R_X,PIPE_XOR_BITS=4,PACKERS=4,DCC,DCC_MAX_COMPRESSED_BLOCK=64B,DCC_INDEPENDENT_64B,DCC_INDEPENDENT_128B,DCC_RETILE) [Rendering]",
        "Native interface": "EGL",
        "GL_RENDERER": "AMD Radeon RX 7700 XT (radeonsi, navi32, LLVM 19.1.7, DRM 3.60, 6.12.15-200.fc41.x86_64)",
        "GL_VENDOR": "AMD",
        "GL_VERSION": "OpenGL ES 3.2 Mesa 24.3.4 (git-769e51468b)",
        "GL_SHADING_LANGUAGE_VERSION": "OpenGL ES GLSL ES 3.20",
        "GL_EXTENSIONS": "GL_EXT_blend_minmax GL_EXT_multi_draw_arrays GL_EXT_texture_filter_anisotropic GL_EXT_texture_compression_s3tc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_rgtc GL_EXT_texture_format_BGRA8888 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth24 GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_mapbuffer GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_stencil8 GL_OES_texture_3D GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_half_float GL_EXT_draw_instanced GL_EXT_texture_sRGB_decode GL_OES_EGL_image GL_OES_depth_texture GL_OES_packed_depth_stencil GL_EXT_texture_type_2_10_10_10_REV GL_NV_conditional_render GL_OES_get_program_binary GL_APPLE_texture_max_level GL_EXT_discard_framebuffer GL_EXT_read_format_bgra GL_EXT_texture_storage GL_NV_pack_subimage GL_NV_texture_barrier GL_EXT_frag_depth GL_NV_fbo_color_attachments GL_OES_EGL_image_external GL_OES_EGL_sync GL_OES_vertex_array_object GL_OES_viewport_array GL_ANGLE_pack_reverse_row_order GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_EXT_occlusion_query_boolean GL_EXT_robustness GL_EXT_texture_rg GL_EXT_unpack_subimage GL_NV_draw_buffers GL_NV_read_buffer GL_NV_read_depth GL_NV_read_depth_stencil GL_NV_read_stencil GL_APPLE_sync GL_EXT_draw_buffers GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_shadow_samplers GL_KHR_debug GL_KHR_robustness GL_KHR_texture_compression_astc_ldr GL_NV_generate_mipmap_sRGB GL_NV_pixel_buffer_object GL_OES_depth_texture_cube_map GL_OES_required_internalformat GL_OES_surfaceless_context GL_EXT_color_buffer_float GL_EXT_debug_label GL_EXT_sRGB_write_control GL_EXT_separate_shader_objects GL_EXT_shader_group_vote GL_EXT_shader_implicit_conversions GL_EXT_shader_integer_mix GL_EXT_tessellation_point_size GL_EXT_tessellation_shader GL_ANDROID_extension_pack_es31a GL_EXT_base_instance GL_EXT_compressed_ETC1_RGB8_sub_texture GL_EXT_copy_image GL_EXT_draw_buffers_indexed GL_EXT_draw_elements_base_vertex GL_EXT_gpu_shader5 GL_EXT_multi_draw_indirect GL_EXT_polygon_offset_clamp GL_EXT_primitive_bounding_box GL_EXT_render_snorm GL_EXT_shader_io_blocks GL_EXT_texture_border_clamp GL_EXT_texture_buffer GL_EXT_texture_cube_map_array GL_EXT_texture_norm16 GL_EXT_texture_view GL_KHR_blend_equation_advanced GL_KHR_context_flush_control GL_KHR_robust_buffer_access_behavior GL_NV_image_formats GL_NV_shader_noperspective_interpolation GL_OES_copy_image GL_OES_draw_buffers_indexed GL_OES_draw_elements_base_vertex GL_OES_gpu_shader5 GL_OES_primitive_bounding_box GL_OES_sample_shading GL_OES_sample_variables GL_OES_shader_io_blocks GL_OES_shader_multisample_interpolation GL_OES_tessellation_point_size GL_OES_tessellation_shader GL_OES_texture_border_clamp GL_OES_texture_buffer GL_OES_texture_cube_map_array GL_OES_texture_stencil8 GL_OES_texture_storage_multisample_2d_array GL_OES_texture_view GL_EXT_blend_func_extended GL_EXT_buffer_storage GL_EXT_float_blend GL_EXT_geometry_point_size GL_EXT_geometry_shader GL_EXT_texture_filter_minmax GL_EXT_texture_sRGB_R8 GL_EXT_texture_sRGB_RG8 GL_KHR_no_error GL_KHR_texture_compression_astc_sliced_3d GL_OES_EGL_image_external_essl3 GL_OES_geometry_point_size GL_OES_geometry_shader GL_OES_shader_image_atomic GL_EXT_clear_texture GL_EXT_clip_cull_distance GL_EXT_disjoint_timer_query GL_EXT_texture_compression_s3tc_srgb GL_EXT_window_rectangles GL_MESA_shader_integer_functions GL_EXT_clip_control GL_EXT_color_buffer_half_float GL_EXT_memory_object GL_EXT_memory_object_fd GL_EXT_semaphore GL_EXT_semaphore_fd GL_EXT_texture_compression_bptc GL_EXT_texture_mirror_clamp_to_edge GL_KHR_parallel_shader_compile GL_NV_alpha_to_coverage_dither_control GL_EXT_EGL_image_storage GL_EXT_texture_shadow_lod GL_INTEL_blackhole_render GL_MESA_framebuffer_flip_y GL_NV_compute_shader_derivatives GL_EXT_demote_to_helper_invocation GL_EXT_depth_clamp GL_EXT_texture_query_lod GL_KHR_shader_subgroup GL_MESA_sampler_objects GL_EXT_EGL_image_storage_compression GL_EXT_texture_storage_compression GL_MESA_bgra GL_MESA_texture_const_bandwidth ",
        "EGL_VERSION": "1.5",
        "EGL_VENDOR": "Mesa Project",
        "EGL_EXTENSIONS": "EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device EGL_EXT_explicit_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_EXT_platform_xcb EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless EGL_ANDROID_blob_cache EGL_ANDROID_native_fence_sync EGL_EXT_buffer_age EGL_EXT_config_select_group EGL_EXT_create_context_robustness EGL_EXT_image_dma_buf_import EGL_EXT_image_dma_buf_import_modifiers EGL_EXT_present_opaque EGL_EXT_query_reset_notification_strategy EGL_EXT_surface_compression EGL_EXT_swap_buffers_with_damage EGL_IMG_context_priority EGL_KHR_cl_event2 EGL_KHR_config_attribs EGL_KHR_context_flush_control EGL_KHR_create_context EGL_KHR_create_context_no_error EGL_KHR_fence_sync EGL_KHR_get_all_proc_addresses EGL_KHR_gl_colorspace EGL_KHR_gl_renderbuffer_image EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_3D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_image_base EGL_KHR_no_config_context EGL_KHR_reusable_sync EGL_KHR_surfaceless_context EGL_KHR_swap_buffers_with_damage EGL_EXT_pixel_format_float EGL_KHR_wait_sync EGL_MESA_configless_context EGL_MESA_drm_image EGL_MESA_gl_interop EGL_MESA_image_dma_buf_export EGL_MESA_query_driver EGL_MESA_x11_native_visual_id EGL_WL_bind_wayland_display EGL_WL_create_wayland_buffer_from_image "
    },
    "Hardware Acceleration Information (Render process)": {
        "Platform": "GBM",
        "DRM version": "amdgpu (AMD GPU) 3.60.0. 0",
        "GL_RENDERER": "AMD Radeon RX 7700 XT (radeonsi, navi32, LLVM 19.1.7, DRM 3.60, 6.12.15-200.fc41.x86_64)",
        "GL_VENDOR": "AMD",
        "GL_VERSION": "OpenGL ES 3.2 Mesa 24.3.4 (git-769e51468b)",
        "GL_SHADING_LANGUAGE_VERSION": "OpenGL ES GLSL ES 3.20",
        "GL_EXTENSIONS": "GL_EXT_blend_minmax GL_EXT_multi_draw_arrays GL_EXT_texture_filter_anisotropic GL_EXT_texture_compression_s3tc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_rgtc GL_EXT_texture_format_BGRA8888 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth24 GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_mapbuffer GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_stencil8 GL_OES_texture_3D GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_half_float GL_EXT_draw_instanced GL_EXT_texture_sRGB_decode GL_OES_EGL_image GL_OES_depth_texture GL_OES_packed_depth_stencil GL_EXT_texture_type_2_10_10_10_REV GL_NV_conditional_render GL_OES_get_program_binary GL_APPLE_texture_max_level GL_EXT_discard_framebuffer GL_EXT_read_format_bgra GL_EXT_texture_storage GL_NV_pack_subimage GL_NV_texture_barrier GL_EXT_frag_depth GL_NV_fbo_color_attachments GL_OES_EGL_image_external GL_OES_EGL_sync GL_OES_vertex_array_object GL_OES_viewport_array GL_ANGLE_pack_reverse_row_order GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_EXT_occlusion_query_boolean GL_EXT_robustness GL_EXT_texture_rg GL_EXT_unpack_subimage GL_NV_draw_buffers GL_NV_read_buffer GL_NV_read_depth GL_NV_read_depth_stencil GL_NV_read_stencil GL_APPLE_sync GL_EXT_draw_buffers GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_shadow_samplers GL_KHR_debug GL_KHR_robustness GL_KHR_texture_compression_astc_ldr GL_NV_generate_mipmap_sRGB GL_NV_pixel_buffer_object GL_OES_depth_texture_cube_map GL_OES_required_internalformat GL_OES_surfaceless_context GL_EXT_color_buffer_float GL_EXT_debug_label GL_EXT_sRGB_write_control GL_EXT_separate_shader_objects GL_EXT_shader_group_vote GL_EXT_shader_implicit_conversions GL_EXT_shader_integer_mix GL_EXT_tessellation_point_size GL_EXT_tessellation_shader GL_ANDROID_extension_pack_es31a GL_EXT_base_instance GL_EXT_compressed_ETC1_RGB8_sub_texture GL_EXT_copy_image GL_EXT_draw_buffers_indexed GL_EXT_draw_elements_base_vertex GL_EXT_gpu_shader5 GL_EXT_multi_draw_indirect GL_EXT_polygon_offset_clamp GL_EXT_primitive_bounding_box GL_EXT_render_snorm GL_EXT_shader_io_blocks GL_EXT_texture_border_clamp GL_EXT_texture_buffer GL_EXT_texture_cube_map_array GL_EXT_texture_norm16 GL_EXT_texture_view GL_KHR_blend_equation_advanced GL_KHR_context_flush_control GL_KHR_robust_buffer_access_behavior GL_NV_image_formats GL_NV_shader_noperspective_interpolation GL_OES_copy_image GL_OES_draw_buffers_indexed GL_OES_draw_elements_base_vertex GL_OES_gpu_shader5 GL_OES_primitive_bounding_box GL_OES_sample_shading GL_OES_sample_variables GL_OES_shader_io_blocks GL_OES_shader_multisample_interpolation GL_OES_tessellation_point_size GL_OES_tessellation_shader GL_OES_texture_border_clamp GL_OES_texture_buffer GL_OES_texture_cube_map_array GL_OES_texture_stencil8 GL_OES_texture_storage_multisample_2d_array GL_OES_texture_view GL_EXT_blend_func_extended GL_EXT_buffer_storage GL_EXT_float_blend GL_EXT_geometry_point_size GL_EXT_geometry_shader GL_EXT_texture_filter_minmax GL_EXT_texture_sRGB_R8 GL_EXT_texture_sRGB_RG8 GL_KHR_no_error GL_KHR_texture_compression_astc_sliced_3d GL_OES_EGL_image_external_essl3 GL_OES_geometry_point_size GL_OES_geometry_shader GL_OES_shader_image_atomic GL_EXT_clear_texture GL_EXT_clip_cull_distance GL_EXT_disjoint_timer_query GL_EXT_texture_compression_s3tc_srgb GL_EXT_window_rectangles GL_MESA_shader_integer_functions GL_EXT_clip_control GL_EXT_color_buffer_half_float GL_EXT_memory_object GL_EXT_memory_object_fd GL_EXT_semaphore GL_EXT_semaphore_fd GL_EXT_texture_compression_bptc GL_EXT_texture_mirror_clamp_to_edge GL_KHR_parallel_shader_compile GL_NV_alpha_to_coverage_dither_control GL_EXT_EGL_image_storage GL_EXT_texture_shadow_lod GL_INTEL_blackhole_render GL_MESA_framebuffer_flip_y GL_NV_compute_shader_derivatives GL_EXT_demote_to_helper_invocation GL_EXT_depth_clamp GL_EXT_texture_query_lod GL_KHR_shader_subgroup GL_MESA_sampler_objects GL_EXT_EGL_image_storage_compression GL_EXT_texture_storage_compression GL_MESA_bgra GL_MESA_texture_const_bandwidth ",
        "EGL_VERSION": "1.5",
        "EGL_VENDOR": "Mesa Project",
        "EGL_EXTENSIONS": "EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device EGL_EXT_explicit_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_EXT_platform_xcb EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless EGL_ANDROID_blob_cache EGL_ANDROID_native_fence_sync EGL_EXT_buffer_age EGL_EXT_config_select_group EGL_EXT_create_context_robustness EGL_EXT_image_dma_buf_import EGL_EXT_image_dma_buf_import_modifiers EGL_EXT_query_reset_notification_strategy EGL_EXT_surface_compression EGL_IMG_context_priority EGL_KHR_cl_event2 EGL_KHR_config_attribs EGL_KHR_context_flush_control EGL_KHR_create_context EGL_KHR_create_context_no_error EGL_KHR_fence_sync EGL_KHR_get_all_proc_addresses EGL_KHR_gl_colorspace EGL_KHR_gl_renderbuffer_image EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_3D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_image EGL_KHR_image_base EGL_KHR_image_pixmap EGL_KHR_no_config_context EGL_KHR_reusable_sync EGL_KHR_surfaceless_context EGL_EXT_pixel_format_float EGL_KHR_wait_sync EGL_MESA_configless_context EGL_MESA_drm_image EGL_MESA_gl_interop EGL_MESA_image_dma_buf_export EGL_MESA_query_driver EGL_MESA_x11_native_visual_id EGL_WL_bind_wayland_display "
    }
}

[Philippe Normand]

that's the left monitor ^^

Now the webkit://gpu when Canary is started on the right monitor:

{
    "Version Information": {
        "WebKit version": "WebKitGTK 2.47.4 (291092@main)",
        "Operating system": "Linux 6.12.15-200.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Feb 18 15:24:05 UTC 2025 x86_64",
        "Desktop": "GNOME",
        "GStreamer version": "1.24.12 (build) GStreamer 1.24.12 (runtime)",
        "GTK version": "4.17.5 (build) 4.17.5 (runtime)"
    },
    "Display Information": {
        "Identifier": "1",
        "Type": "Wayland",
        "Screen geometry": "1920,0 1920x1080",
        "Screen work area": "1920,0 1920x1080",
        "Depth": "24",
        "Bits per color component": "8",
        "Font Scaling DPI": "96",
        "Screen DPI": "81.13514004658197",
        "VBlank type": "DRM",
        "VBlank refresh rate": "60Hz",
        "DRM Device": "/dev/dri/card0",
        "DRM Render Node": "/dev/dri/renderD128"
    },
    "API": "OpenGL (libepoxy)",
    "Hardware Acceleration Information": {
        "Policy": "always",
        "WebGL enabled": "Yes",
        "2D canvas": "Accelerated",
        "Renderer": "DMABuf (Supported buffers: Hardware, Shared Memory)",
        "Buffer format": "Unknown",
        "Native interface": "EGL"
    },
    "Hardware Acceleration Information (Render process)": {
        "Platform": "GBM",
        "DRM version": "amdgpu (AMD GPU) 3.60.0. 0",
        "GL_RENDERER": "AMD Radeon RX 7700 XT (radeonsi, navi32, LLVM 19.1.7, DRM 3.60, 6.12.15-200.fc41.x86_64)",
        "GL_VENDOR": "AMD",
        "GL_VERSION": "OpenGL ES 3.2 Mesa 24.3.4 (git-769e51468b)",
        "GL_SHADING_LANGUAGE_VERSION": "OpenGL ES GLSL ES 3.20",
        "GL_EXTENSIONS": "GL_EXT_blend_minmax GL_EXT_multi_draw_arrays GL_EXT_texture_filter_anisotropic GL_EXT_texture_compression_s3tc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_rgtc GL_EXT_texture_format_BGRA8888 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth24 GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_mapbuffer GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_stencil8 GL_OES_texture_3D GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_half_float GL_EXT_draw_instanced GL_EXT_texture_sRGB_decode GL_OES_EGL_image GL_OES_depth_texture GL_OES_packed_depth_stencil GL_EXT_texture_type_2_10_10_10_REV GL_NV_conditional_render GL_OES_get_program_binary GL_APPLE_texture_max_level GL_EXT_discard_framebuffer GL_EXT_read_format_bgra GL_EXT_texture_storage GL_NV_pack_subimage GL_NV_texture_barrier GL_EXT_frag_depth GL_NV_fbo_color_attachments GL_OES_EGL_image_external GL_OES_EGL_sync GL_OES_vertex_array_object GL_OES_viewport_array GL_ANGLE_pack_reverse_row_order GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_EXT_occlusion_query_boolean GL_EXT_robustness GL_EXT_texture_rg GL_EXT_unpack_subimage GL_NV_draw_buffers GL_NV_read_buffer GL_NV_read_depth GL_NV_read_depth_stencil GL_NV_read_stencil GL_APPLE_sync GL_EXT_draw_buffers GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_shadow_samplers GL_KHR_debug GL_KHR_robustness GL_KHR_texture_compression_astc_ldr GL_NV_generate_mipmap_sRGB GL_NV_pixel_buffer_object GL_OES_depth_texture_cube_map GL_OES_required_internalformat GL_OES_surfaceless_context GL_EXT_color_buffer_float GL_EXT_debug_label GL_EXT_sRGB_write_control GL_EXT_separate_shader_objects GL_EXT_shader_group_vote GL_EXT_shader_implicit_conversions GL_EXT_shader_integer_mix GL_EXT_tessellation_point_size GL_EXT_tessellation_shader GL_ANDROID_extension_pack_es31a GL_EXT_base_instance GL_EXT_compressed_ETC1_RGB8_sub_texture GL_EXT_copy_image GL_EXT_draw_buffers_indexed GL_EXT_draw_elements_base_vertex GL_EXT_gpu_shader5 GL_EXT_multi_draw_indirect GL_EXT_polygon_offset_clamp GL_EXT_primitive_bounding_box GL_EXT_render_snorm GL_EXT_shader_io_blocks GL_EXT_texture_border_clamp GL_EXT_texture_buffer GL_EXT_texture_cube_map_array GL_EXT_texture_norm16 GL_EXT_texture_view GL_KHR_blend_equation_advanced GL_KHR_context_flush_control GL_KHR_robust_buffer_access_behavior GL_NV_image_formats GL_NV_shader_noperspective_interpolation GL_OES_copy_image GL_OES_draw_buffers_indexed GL_OES_draw_elements_base_vertex GL_OES_gpu_shader5 GL_OES_primitive_bounding_box GL_OES_sample_shading GL_OES_sample_variables GL_OES_shader_io_blocks GL_OES_shader_multisample_interpolation GL_OES_tessellation_point_size GL_OES_tessellation_shader GL_OES_texture_border_clamp GL_OES_texture_buffer GL_OES_texture_cube_map_array GL_OES_texture_stencil8 GL_OES_texture_storage_multisample_2d_array GL_OES_texture_view GL_EXT_blend_func_extended GL_EXT_buffer_storage GL_EXT_float_blend GL_EXT_geometry_point_size GL_EXT_geometry_shader GL_EXT_texture_filter_minmax GL_EXT_texture_sRGB_R8 GL_EXT_texture_sRGB_RG8 GL_KHR_no_error GL_KHR_texture_compression_astc_sliced_3d GL_OES_EGL_image_external_essl3 GL_OES_geometry_point_size GL_OES_geometry_shader GL_OES_shader_image_atomic GL_EXT_clear_texture GL_EXT_clip_cull_distance GL_EXT_disjoint_timer_query GL_EXT_texture_compression_s3tc_srgb GL_EXT_window_rectangles GL_MESA_shader_integer_functions GL_EXT_clip_control GL_EXT_color_buffer_half_float GL_EXT_memory_object GL_EXT_memory_object_fd GL_EXT_semaphore GL_EXT_semaphore_fd GL_EXT_texture_compression_bptc GL_EXT_texture_mirror_clamp_to_edge GL_KHR_parallel_shader_compile GL_NV_alpha_to_coverage_dither_control GL_EXT_EGL_image_storage GL_EXT_texture_shadow_lod GL_INTEL_blackhole_render GL_MESA_framebuffer_flip_y GL_NV_compute_shader_derivatives GL_EXT_demote_to_helper_invocation GL_EXT_depth_clamp GL_EXT_texture_query_lod GL_KHR_shader_subgroup GL_MESA_sampler_objects GL_EXT_EGL_image_storage_compression GL_EXT_texture_storage_compression GL_MESA_bgra GL_MESA_texture_const_bandwidth ",
        "EGL_VERSION": "1.5",
        "EGL_VENDOR": "Mesa Project",
        "EGL_EXTENSIONS": "EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device EGL_EXT_explicit_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_EXT_platform_xcb EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless EGL_ANDROID_blob_cache EGL_ANDROID_native_fence_sync EGL_EXT_buffer_age EGL_EXT_config_select_group EGL_EXT_create_context_robustness EGL_EXT_image_dma_buf_import EGL_EXT_image_dma_buf_import_modifiers EGL_EXT_query_reset_notification_strategy EGL_EXT_surface_compression EGL_IMG_context_priority EGL_KHR_cl_event2 EGL_KHR_config_attribs EGL_KHR_context_flush_control EGL_KHR_create_context EGL_KHR_create_context_no_error EGL_KHR_fence_sync EGL_KHR_get_all_proc_addresses EGL_KHR_gl_colorspace EGL_KHR_gl_renderbuffer_image EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_3D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_image EGL_KHR_image_base EGL_KHR_image_pixmap EGL_KHR_no_config_context EGL_KHR_reusable_sync EGL_KHR_surfaceless_context EGL_EXT_pixel_format_float EGL_KHR_wait_sync EGL_MESA_configless_context EGL_MESA_drm_image EGL_MESA_gl_interop EGL_MESA_image_dma_buf_export EGL_MESA_query_driver EGL_MESA_x11_native_visual_id EGL_WL_bind_wayland_display "
    }
}

[Carlos Garcia Campos]

Does this happen with WPE too?

[Philippe Normand]

Nope

[Carlos Garcia Campos]

With new api?

[Philippe Normand]

I checked Cog only. I can test the new api later today.

[Philippe Normand]

(In reply to Carlos Garcia Campos from comment #4)
> With new api?

With new API the issue doesn't happen. This is definitely GTK-specific.

[Carlos Garcia Campos]

Could you share webkit://gpu on both monitors with wpe new api, please?

[Philippe Normand]

Right:

GPU information
{
    "Version Information": {
        "WebKit version": "WPE WebKit 2.47.4 (291110@main)",
        "Operating system": "Linux 6.12.15-200.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Feb 18 15:24:05 UTC 2025 x86_64",
        "Desktop": "GNOME",
        "GStreamer version": "1.24.12 (build) GStreamer 1.24.12 (runtime)"
    },
    "Display Information": {
        "Identifier": "36",
        "Screen geometry": "1920,0 1920x1080",
        "Screen work area": "1920,0 1920x1080",
        "Depth": "24",
        "Bits per color component": "8",
        "Font Scaling DPI": "81.13514004658197",
        "Screen DPI": "81.13514004658197",
        "VBlank type": "DRM",
        "VBlank refresh rate": "60Hz",
        "DRM Device": "/dev/dri/card0",
        "DRM Render Node": "/dev/dri/renderD128"
    },
    "API": "OpenGL (libepoxy)",
    "Hardware Acceleration Information": {
        "Policy": "always",
        "WebGL enabled": "Yes",
        "2D canvas": "Accelerated",
        "Renderer": "DMABuf (Supported buffers: Hardware, Shared Memory)",
        "Buffer format": "DMA-BUF: XR24 (AMD_GFX11,64KB_R_X,PIPE_XOR_BITS=4,PACKERS=4,DCC,DCC_MAX_COMPRESSED_BLOCK=128B,DCC_INDEPENDENT_128B,DCC_PIPE_ALIGN) [Rendering]",
        "Native interface": "EGL"
    },
    "Hardware Acceleration Information (Render process)": {
        "Platform": "GBM",
        "DRM version": "amdgpu (AMD GPU) 3.60.0. 0",
        "GL_RENDERER": "AMD Radeon RX 7700 XT (radeonsi, navi32, LLVM 19.1.0, DRM 3.60, 6.12.15-200.fc41.x86_64)",
        "GL_VENDOR": "AMD",
        "GL_VERSION": "OpenGL ES 3.2 Mesa 24.3.4",
        "GL_SHADING_LANGUAGE_VERSION": "OpenGL ES GLSL ES 3.20",
        "GL_EXTENSIONS": "GL_EXT_blend_minmax GL_EXT_multi_draw_arrays GL_EXT_texture_filter_anisotropic GL_EXT_texture_compression_s3tc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_rgtc GL_EXT_texture_format_BGRA8888 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth24 GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_mapbuffer GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_stencil8 GL_OES_texture_3D GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_half_float GL_EXT_draw_instanced GL_EXT_texture_sRGB_decodeGL_OES_EGL_image GL_OES_depth_texture GL_OES_packed_depth_stencil GL_EXT_texture_type_2_10_10_10_REV GL_NV_conditional_render GL_OES_get_program_binary GL_APPLE_texture_max_level GL_EXT_discard_framebuffer GL_EXT_read_format_bgra GL_EXT_texture_storage GL_NV_pack_subimage GL_NV_texture_barrier GL_EXT_frag_depth GL_NV_fbo_color_attachments GL_OES_EGL_image_external GL_OES_EGL_sync GL_OES_vertex_array_object GL_OES_viewport_array GL_ANGLE_pack_reverse_row_order GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_EXT_occlusion_query_boolean GL_EXT_robustness GL_EXT_texture_rg GL_EXT_unpack_subimage GL_NV_draw_buffers GL_NV_read_buffer GL_NV_read_depth GL_NV_read_depth_stencil GL_NV_read_stencil GL_APPLE_sync GL_EXT_draw_buffers GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_shadow_samplers GL_KHR_debug GL_KHR_robustness GL_KHR_texture_compression_astc_ldr GL_NV_generate_mipmap_sRGB GL_NV_pixel_buffer_object GL_OES_depth_texture_cube_map GL_OES_required_internalformat GL_OES_surfaceless_context GL_EXT_color_buffer_float GL_EXT_debug_label GL_EXT_sRGB_write_control GL_EXT_separate_shader_objects GL_EXT_shader_group_vote GL_EXT_shader_implicit_conversions GL_EXT_shader_integer_mix GL_EXT_tessellation_point_size GL_EXT_tessellation_shader GL_ANDROID_extension_pack_es31a GL_EXT_base_instance GL_EXT_compressed_ETC1_RGB8_sub_texture GL_EXT_copy_image GL_EXT_draw_buffers_indexed GL_EXT_draw_elements_base_vertex GL_EXT_gpu_shader5 GL_EXT_multi_draw_indirect GL_EXT_polygon_offset_clamp GL_EXT_primitive_bounding_box GL_EXT_render_snorm GL_EXT_shader_io_blocks GL_EXT_texture_border_clamp GL_EXT_texture_buffer GL_EXT_texture_cube_map_array GL_EXT_texture_norm16 GL_EXT_texture_view GL_KHR_blend_equation_advanced GL_KHR_context_flush_control GL_KHR_robust_buffer_access_behavior GL_NV_image_formats GL_NV_shader_noperspective_interpolation GL_OES_copy_image GL_OES_draw_buffers_indexed GL_OES_draw_elements_base_vertex GL_OES_gpu_shader5 GL_OES_primitive_bounding_box GL_OES_sample_shading GL_OES_sample_variables GL_OES_shader_io_blocks GL_OES_shader_multisample_interpolation GL_OES_tessellation_point_size GL_OES_tessellation_shader GL_OES_texture_border_clamp GL_OES_texture_buffer GL_OES_texture_cube_map_array GL_OES_texture_stencil8 GL_OES_texture_storage_multisample_2d_array GL_OES_texture_view GL_EXT_blend_func_extended GL_EXT_buffer_storage GL_EXT_float_blend GL_EXT_geometry_point_size GL_EXT_geometry_shader GL_EXT_texture_filter_minmax GL_EXT_texture_sRGB_R8 GL_EXT_texture_sRGB_RG8 GL_KHR_no_error GL_KHR_texture_compression_astc_sliced_3d GL_OES_EGL_image_external_essl3 GL_OES_geometry_point_size GL_OES_geometry_shader GL_OES_shader_image_atomic GL_EXT_clear_texture GL_EXT_clip_cull_distance GL_EXT_disjoint_timer_query GL_EXT_texture_compression_s3tc_srgb GL_EXT_window_rectangles GL_MESA_shader_integer_functions GL_EXT_clip_control GL_EXT_color_buffer_half_float GL_EXT_memory_object GL_EXT_memory_object_fd GL_EXT_semaphore GL_EXT_semaphore_fd GL_EXT_texture_compression_bptc GL_EXT_texture_mirror_clamp_to_edge GL_KHR_parallel_shader_compile GL_NV_alpha_to_coverage_dither_control GL_EXT_EGL_image_storage GL_EXT_texture_shadow_lod GL_INTEL_blackhole_render GL_MESA_framebuffer_flip_y GL_NV_compute_shader_derivatives GL_EXT_demote_to_helper_invocation GL_EXT_depth_clamp GL_EXT_texture_query_lod GL_KHR_shader_subgroup GL_MESA_sampler_objects GL_EXT_EGL_image_storage_compression GL_EXT_texture_storage_compression GL_MESA_bgra GL_MESA_texture_const_bandwidth ",
        "EGL_VERSION": "1.5",
        "EGL_VENDOR": "Mesa Project",
        "EGL_EXTENSIONS": "EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device EGL_EXT_explicit_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_EXT_platform_xcb EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless EGL_ANDROID_blob_cache EGL_ANDROID_native_fence_sync EGL_EXT_buffer_age EGL_EXT_config_select_group EGL_EXT_create_context_robustness EGL_EXT_image_dma_buf_import EGL_EXT_image_dma_buf_import_modifiers EGL_EXT_query_reset_notification_strategy EGL_EXT_surface_compression EGL_IMG_context_priority EGL_KHR_cl_event2 EGL_KHR_config_attribs EGL_KHR_context_flush_control EGL_KHR_create_context EGL_KHR_create_context_no_error EGL_KHR_fence_sync EGL_KHR_get_all_proc_addresses EGL_KHR_gl_colorspace EGL_KHR_gl_renderbuffer_image EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_3D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_image EGL_KHR_image_base EGL_KHR_image_pixmap EGL_KHR_no_config_context EGL_KHR_reusable_sync EGL_KHR_surfaceless_context EGL_EXT_pixel_format_float EGL_KHR_wait_sync EGL_MESA_configless_context EGL_MESA_drm_image EGL_MESA_gl_interop EGL_MESA_image_dma_buf_export EGL_MESA_query_driver EGL_MESA_x11_native_visual_id EGL_WL_bind_wayland_display "
    }
}

Left:

GPU information
{
    "Version Information": {
        "WebKit version": "WPE WebKit 2.47.4 (291110@main)",
        "Operating system": "Linux 6.12.15-200.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Feb 18 15:24:05 UTC 2025 x86_64",
        "Desktop": "GNOME",
        "GStreamer version": "1.24.12 (build) GStreamer 1.24.12 (runtime)"
    },
    "Display Information": {
        "Identifier": "37",
        "Screen geometry": "1920,0 1920x1080",
        "Screen work area": "1920,0 1920x1080",
        "Depth": "24",
        "Bits per color component": "8",
        "Font Scaling DPI": "81.13514004658197",
        "Screen DPI": "81.13514004658197",
        "VBlank type": "DRM",
        "VBlank refresh rate": "59Hz",
        "DRM Device": "/dev/dri/card0",
        "DRM Render Node": "/dev/dri/renderD128"
    },
    "API": "OpenGL (libepoxy)",
    "Hardware Acceleration Information": {
        "Policy": "always",
        "WebGL enabled": "Yes",
        "2D canvas": "Accelerated",
        "Renderer": "DMABuf (Supported buffers: Hardware, Shared Memory)",
        "Buffer format": "DMA-BUF: XR24 (AMD_GFX11,64KB_R_X,PIPE_XOR_BITS=4,PACKERS=4,DCC,DCC_MAX_COMPRESSED_BLOCK=128B,DCC_INDEPENDENT_128B,DCC_PIPE_ALIGN) [Rendering]",
        "Native interface": "EGL"
    },
    "Hardware Acceleration Information (Render process)": {
        "Platform": "GBM",
        "DRM version": "amdgpu (AMD GPU) 3.60.0. 0",
        "GL_RENDERER": "AMD Radeon RX 7700 XT (radeonsi, navi32, LLVM 19.1.0, DRM 3.60, 6.12.15-200.fc41.x86_64)",
        "GL_VENDOR": "AMD",
        "GL_VERSION": "OpenGL ES 3.2 Mesa 24.3.4",
        "GL_SHADING_LANGUAGE_VERSION": "OpenGL ES GLSL ES 3.20",
        "GL_EXTENSIONS": "GL_EXT_blend_minmax GL_EXT_multi_draw_arrays GL_EXT_texture_filter_anisotropic GL_EXT_texture_compression_s3tc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_rgtc GL_EXT_texture_format_BGRA8888 GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth24 GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_mapbuffer GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_stencil8 GL_OES_texture_3D GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_half_float GL_EXT_draw_instanced GL_EXT_texture_sRGB_decodeGL_OES_EGL_image GL_OES_depth_texture GL_OES_packed_depth_stencil GL_EXT_texture_type_2_10_10_10_REV GL_NV_conditional_render GL_OES_get_program_binary GL_APPLE_texture_max_level GL_EXT_discard_framebuffer GL_EXT_read_format_bgra GL_EXT_texture_storage GL_NV_pack_subimage GL_NV_texture_barrier GL_EXT_frag_depth GL_NV_fbo_color_attachments GL_OES_EGL_image_external GL_OES_EGL_sync GL_OES_vertex_array_object GL_OES_viewport_array GL_ANGLE_pack_reverse_row_order GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_EXT_occlusion_query_boolean GL_EXT_robustness GL_EXT_texture_rg GL_EXT_unpack_subimage GL_NV_draw_buffers GL_NV_read_buffer GL_NV_read_depth GL_NV_read_depth_stencil GL_NV_read_stencil GL_APPLE_sync GL_EXT_draw_buffers GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_shadow_samplers GL_KHR_debug GL_KHR_robustness GL_KHR_texture_compression_astc_ldr GL_NV_generate_mipmap_sRGB GL_NV_pixel_buffer_object GL_OES_depth_texture_cube_map GL_OES_required_internalformat GL_OES_surfaceless_context GL_EXT_color_buffer_float GL_EXT_debug_label GL_EXT_sRGB_write_control GL_EXT_separate_shader_objects GL_EXT_shader_group_vote GL_EXT_shader_implicit_conversions GL_EXT_shader_integer_mix GL_EXT_tessellation_point_size GL_EXT_tessellation_shader GL_ANDROID_extension_pack_es31a GL_EXT_base_instance GL_EXT_compressed_ETC1_RGB8_sub_texture GL_EXT_copy_image GL_EXT_draw_buffers_indexed GL_EXT_draw_elements_base_vertex GL_EXT_gpu_shader5 GL_EXT_multi_draw_indirect GL_EXT_polygon_offset_clamp GL_EXT_primitive_bounding_box GL_EXT_render_snorm GL_EXT_shader_io_blocks GL_EXT_texture_border_clamp GL_EXT_texture_buffer GL_EXT_texture_cube_map_array GL_EXT_texture_norm16 GL_EXT_texture_view GL_KHR_blend_equation_advanced GL_KHR_context_flush_control GL_KHR_robust_buffer_access_behavior GL_NV_image_formats GL_NV_shader_noperspective_interpolation GL_OES_copy_image GL_OES_draw_buffers_indexed GL_OES_draw_elements_base_vertex GL_OES_gpu_shader5 GL_OES_primitive_bounding_box GL_OES_sample_shading GL_OES_sample_variables GL_OES_shader_io_blocks GL_OES_shader_multisample_interpolation GL_OES_tessellation_point_size GL_OES_tessellation_shader GL_OES_texture_border_clamp GL_OES_texture_buffer GL_OES_texture_cube_map_array GL_OES_texture_stencil8 GL_OES_texture_storage_multisample_2d_array GL_OES_texture_view GL_EXT_blend_func_extended GL_EXT_buffer_storage GL_EXT_float_blend GL_EXT_geometry_point_size GL_EXT_geometry_shader GL_EXT_texture_filter_minmax GL_EXT_texture_sRGB_R8 GL_EXT_texture_sRGB_RG8 GL_KHR_no_error GL_KHR_texture_compression_astc_sliced_3d GL_OES_EGL_image_external_essl3 GL_OES_geometry_point_size GL_OES_geometry_shader GL_OES_shader_image_atomic GL_EXT_clear_texture GL_EXT_clip_cull_distance GL_EXT_disjoint_timer_query GL_EXT_texture_compression_s3tc_srgb GL_EXT_window_rectangles GL_MESA_shader_integer_functions GL_EXT_clip_control GL_EXT_color_buffer_half_float GL_EXT_memory_object GL_EXT_memory_object_fd GL_EXT_semaphore GL_EXT_semaphore_fd GL_EXT_texture_compression_bptc GL_EXT_texture_mirror_clamp_to_edge GL_KHR_parallel_shader_compile GL_NV_alpha_to_coverage_dither_control GL_EXT_EGL_image_storage GL_EXT_texture_shadow_lod GL_INTEL_blackhole_render GL_MESA_framebuffer_flip_y GL_NV_compute_shader_derivatives GL_EXT_demote_to_helper_invocation GL_EXT_depth_clamp GL_EXT_texture_query_lod GL_KHR_shader_subgroup GL_MESA_sampler_objects GL_EXT_EGL_image_storage_compression GL_EXT_texture_storage_compression GL_MESA_bgra GL_MESA_texture_const_bandwidth ",
        "EGL_VERSION": "1.5",
        "EGL_VENDOR": "Mesa Project",
        "EGL_EXTENSIONS": "EGL_EXT_device_base EGL_EXT_device_enumeration EGL_EXT_device_query EGL_EXT_platform_base EGL_KHR_client_get_all_proc_addresses EGL_EXT_client_extensions EGL_KHR_debug EGL_EXT_platform_device EGL_EXT_explicit_device EGL_EXT_platform_wayland EGL_KHR_platform_wayland EGL_EXT_platform_x11 EGL_KHR_platform_x11 EGL_EXT_platform_xcb EGL_MESA_platform_gbm EGL_KHR_platform_gbm EGL_MESA_platform_surfaceless EGL_ANDROID_blob_cache EGL_ANDROID_native_fence_sync EGL_EXT_buffer_age EGL_EXT_config_select_group EGL_EXT_create_context_robustness EGL_EXT_image_dma_buf_import EGL_EXT_image_dma_buf_import_modifiers EGL_EXT_query_reset_notification_strategy EGL_EXT_surface_compression EGL_IMG_context_priority EGL_KHR_cl_event2 EGL_KHR_config_attribs EGL_KHR_context_flush_control EGL_KHR_create_context EGL_KHR_create_context_no_error EGL_KHR_fence_sync EGL_KHR_get_all_proc_addresses EGL_KHR_gl_colorspace EGL_KHR_gl_renderbuffer_image EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_3D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_image EGL_KHR_image_base EGL_KHR_image_pixmap EGL_KHR_no_config_context EGL_KHR_reusable_sync EGL_KHR_surfaceless_context EGL_EXT_pixel_format_float EGL_KHR_wait_sync EGL_MESA_configless_context EGL_MESA_drm_image EGL_MESA_gl_interop EGL_MESA_image_dma_buf_export EGL_MESA_query_driver EGL_MESA_x11_native_visual_id EGL_WL_bind_wayland_display "
    }
}

[Carlos Garcia Campos]

Could you try forcing a buffer format with WEBKIT_DMABUF_RENDERER_BUFFER_FORMAT=XR24:0 ?

[Philippe Normand]

That doesn't help unfortunately.

[Philippe Normand]

This issue doesn't happen in GTK3 builds.

[Philippe Normand]

And today the issue is gone, somehow... This is really weird... Let's close this for now.

[Philippe Normand]

Happening again. In 2.48.0.

[Philippe Normand]

Workaround, make sure the app launches on the "good" monitor, then move it to "bad" one, but then the text is all blurry...

[Adrian Perez]

(In reply to Philippe Normand from comment #14)
> Workaround, make sure the app launches on the "good" monitor, then move it
> to "bad" one, but then the text is all blurry...

That's also how I can workaround the issue described in bug #277684 -- which I am 99,9% has the same root cause.

[Philippe Normand]

I don't see this here fwiw. "Failed to create GBM buffer of size 0x0: Invalid argument"

[Adrian Perez]

Note that the “good” monitor is always the one reported *first* to Wayland clients. I can get into a state where my monitor that is plugged using DisplayPort is always the “bad” one doing this:

1. Power off the monitor connected on DisplayPort. For my particular model (Asus MG24U) the video card will report that as a disconnection. The compositor removes its internal structures for this output. Now there is only one other monitor (Fujitsu/DVI) connected.

2. Power on back the monitor. The compositor gets a notification from the driver that a new display was attached, and it *appends* a structure for the Asus/DP monitor.

3. The compositor now reports the Fujitsu/DVI monitor first, the Asus/DP as second, when iterating the Wayland registry.
   - Trying to open an application with a web view on the second, “bad” monitor (Asus/DP) results in blank screen.

4. Physically disconnecting the *other* (Fujitsu/DVI) monitor, and reconnecting it back repeats the above process, but now this monitor is the *second* reported when iterating the Wayland registry.
   - Interestingly enough, now opening applications works on both monitors. But repeating steps 1-2 above always results in the monitor plugged on DisplayPort (the Asus) being in a “bad” state.

From the observations above, it looks like some code inside WebKit may be enumerating things in an order different from that of the Wayland compositor, or making some assumption somewhere until the information is all gathered from the Wayland compositor before trying to initialize things.

[Adrian Perez]

(In reply to Philippe Normand from comment #16)
> I don't see this here fwiw. "Failed to create GBM buffer of size 0x0:
> Invalid argument"

Regardless, I am still quite sure it has to be the same or almost the same root cause.

[Michael Catanzaro]

(In reply to Philippe Normand from comment #16)
> I don't see this here fwiw. "Failed to create GBM buffer of size 0x0:
> Invalid argument"

In addition to bug #277684, this also looks like bug #263208.

[Philippe Normand]

This is related with fractional scaling btw. If I set my 4K monitor to 100% instead of 200% the issue does not happen.

[Philippe Normand]

gtk_widget_render is called once only when the issue happens... 

Also something I noticed, loading a new URL in a "blank/broken" webview actually works, whatever the monitor.

[Philippe Normand]

export WEBKIT_DISABLE_DMABUF_RENDERER=1 also fixes rendering, whatever the monitor/scaling.

[Philippe Normand]

ThreadedCompositor::renderLayerTree() exits early because viewportSize is empty...

It seems the WebPage::setSize() doesn't update the ThreadedCompositor::m_attributes... 

In a GTK3 build with MB starting on my 4K screen scaled at 2x, viewportSize=2048x1460 and scale is 2.0.
In a GTK4 build with MB starting on my 4K screen scaled at 2x, viewportSize=0x0. If I force it to webPage.size() which is 1024x693 and webPage.deviceScaleFactor which is 2.0 then the WebView is rendered but clipped (I'll attach a screenshot).

[Philippe Normand]

Created attachment 474677 [details]
screenshot

[Philippe Normand]

Can someone familiar with rendering please provide guidance? Thanks.

[Philippe Normand]

Pull request: https://github.com/WebKit/WebKit/pull/44010

[Evan Mohr]

*** Bug 290668 has been marked as a duplicate of this bug. ***

[Carlos Garcia Campos]

Pull request: https://github.com/WebKit/WebKit/pull/44592

[EWS]

Committed 294238@main (0e9adfa4acf1): <https://commits.webkit.org/294238@main>

Reviewed commits have been landed. Closing PR #44592 and removing active labels.

[Adrian Perez]

*** Bug 291523 has been marked as a duplicate of this bug. ***

[Jeff Fortin]

*** Bug 277684 has been marked as a duplicate of this bug. ***