UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Example URL:

Steps to reproduce the problem:
1. Go to youtube.com (for example) and play a video 
2. Don't move your mouse or press any keys

What is the expected behavior?
I expect my display to stay on the same brightness level.

What went wrong?
Instead, my display dims after X seconds. I need to tick "Presentation mode" explicitly (see attached screenshot) to prevent the display from dimming while watching the video.

Did this work before? N/A 

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? Yes

Chrome version: 69.0.3497.100  Channel: stable
OS Version: Fedora 28
Flash Version: 

Contents of chrome://gpu: 

Graphics Feature Status
Canvas: Hardware accelerated
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
Out-of-process Rasterization: Disabled
Hardware Protected Video Decode: Unavailable
Rasterization: Software only. Hardware acceleration disabled
Skia Deferred Display List: Disabled
Skia Renderer: Disabled
Surface Synchronization: Enabled
Video Decode: Unavailable
Viz Service Display Compositor: Disabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
Driver Bug Workarounds
adjust_src_dst_region_for_blitframebuffer
clear_uniforms_before_first_program_use
count_all_in_varyings_packing
decode_encode_srgb_for_generatemipmap
disable_chromium_framebuffer_multisample
disable_framebuffer_cmaa
disable_post_sub_buffers_for_onscreen_surfaces
msaa_is_slow
scalarize_vec_and_mat_constructor_args
Problems Detected
Accelerated video decode is unavailable on Linux: 137247
Disabled Features: accelerated_video_decode
Protected video decoding with swap chain is for Windows and Intel only
Disabled Features: protected_video_decode
Clear uniforms before first program use on all platforms: 124764, 349137
Applied Workarounds: clear_uniforms_before_first_program_use
Mesa drivers in Linux handle varyings without static use incorrectly: 333885
Applied Workarounds: count_all_in_varyings_packing
Multisampling is buggy in Intel IvyBridge: 116370
Applied Workarounds: disable_chromium_framebuffer_multisample
Disable partial swaps on Mesa drivers (detected with GL_RENDERER): 339493
Applied Workarounds: disable_post_sub_buffers_for_onscreen_surfaces
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args
On Intel GPUs MSAA performance is not acceptable for GPU rasterization: 527565
Applied Workarounds: msaa_is_slow
Timer queries crash on Intel GPUs on Linux: 540543, 576991
Applied Workarounds: disable(GL_ARB_timer_query), disable(GL_EXT_timer_query)
Use GL_INTEL_framebuffer_CMAA on ChromeOS: 535198
Applied Workarounds: disable_framebuffer_cmaa
Disable partial swaps on Mesa drivers (detected with GL_VERSION): 339493
Applied Workarounds: disable_post_sub_buffers_for_onscreen_surfaces
Decode and encode before generateMipmap for srgb format textures on os except macosx: 634519
Applied Workarounds: decode_encode_srgb_for_generatemipmap
adjust src/dst region if blitting pixels outside read framebuffer on Linux Intel: 664740
Applied Workarounds: adjust_src_dst_region_for_blitframebuffer
Disable KHR_blend_equation_advanced until cc shaders are updated: 661715
Applied Workarounds: disable(GL_KHR_blend_equation_advanced), disable(GL_KHR_blend_equation_advanced_coherent)
Don't expose disjoint_timer_query extensions to WebGL: 808744
Native GpuMemoryBuffers have been disabled, either via about:flags or command line.
Disabled Features: native_gpu_memory_buffers
Viz service display compositor is not enabled by default.
Disabled Features: viz_display_compositor
Skia renderer is not used by default.
Disabled Features: skia_renderer
Skia deferred display list is not used by default.
Disabled Features: skia_deferred_display_list
Version Information
Data exported	2018-09-27T09:27:34.554Z
Chrome version	Chrome/69.0.3497.100
Operating system	Linux 4.18.9-200.fc28.x86_64
Software rendering list URL	https://chromium.googlesource.com/chromium/src/+/8920e690dd011895672947112477d10d5c8afb09/gpu/config/software_rendering_list.json
Driver bug list URL	https://chromium.googlesource.com/chromium/src/+/8920e690dd011895672947112477d10d5c8afb09/gpu/config/gpu_driver_bug_list.json
ANGLE commit id	6ffc489d4f18
2D graphics backend	Skia/69 e110fd1ebd2d559838c49a8821ebf18986bd6ec2-
Command Line	/usr/bin/google-chrome-stable --flag-switches-begin --enable-features=NativeNotifications,NewStyleNotifications --flag-switches-end %U
Driver Information
Initialization time	243
In-process GPU	false
Passthrough Command Decoder	false
Sandboxed	true
GPU0	VENDOR = 0x8086 [Intel Open Source Technology Center], DEVICE= 0x0166 [Mesa DRI Intel(R) Ivybridge Mobile ] *ACTIVE*
Optimus	false
AMD switchable	false
Driver vendor	Mesa
Driver version	18.0.5
Driver date	
Pixel shader version	1.30
Vertex shader version	1.30
Max. MSAA samples	8
Machine model name	
Machine model version	
GL_VENDOR	Intel Open Source Technology Center
GL_RENDERER	Mesa DRI Intel(R) Ivybridge Mobile
GL_VERSION	3.0 Mesa 18.0.5
GL_EXTENSIONS	GL_3DFX_texture_compression_FXT1 GL_AMD_conservative_depth GL_AMD_draw_buffers_blend GL_AMD_seamless_cubemap_per_texture GL_AMD_shader_trinary_minmax GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_APPLE_object_purgeable GL_APPLE_packed_pixels GL_ARB_ES2_compatibility GL_ARB_ES3_compatibility GL_ARB_arrays_of_arrays GL_ARB_blend_func_extended GL_ARB_buffer_storage GL_ARB_clear_buffer_object GL_ARB_clear_texture GL_ARB_clip_control GL_ARB_color_buffer_float GL_ARB_compressed_texture_pixel_storage GL_ARB_compute_shader GL_ARB_conditional_render_inverted GL_ARB_conservative_depth GL_ARB_copy_buffer GL_ARB_copy_image GL_ARB_cull_distance GL_ARB_debug_output GL_ARB_depth_buffer_float GL_ARB_depth_clamp GL_ARB_depth_texture GL_ARB_derivative_control GL_ARB_draw_buffers GL_ARB_draw_buffers_blend GL_ARB_draw_elements_base_vertex GL_ARB_draw_instanced GL_ARB_explicit_attrib_location GL_ARB_explicit_uniform_location GL_ARB_fragment_coord_conventions GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_framebuffer_no_attachments GL_ARB_framebuffer_object GL_ARB_framebuffer_sRGB GL_ARB_get_program_binary GL_ARB_get_texture_sub_image GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_internalformat_query2 GL_ARB_invalidate_subdata GL_ARB_map_buffer_alignment GL_ARB_map_buffer_range GL_ARB_multi_bind GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_occlusion_query2 GL_ARB_pipeline_statistics_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_polygon_offset_clamp GL_ARB_program_interface_query GL_ARB_provoking_vertex GL_ARB_robustness GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_seamless_cube_map GL_ARB_seamless_cubemap_per_texture GL_ARB_separate_shader_objects GL_ARB_shader_atomic_counter_ops GL_ARB_shader_atomic_counters GL_ARB_shader_bit_encoding GL_ARB_shader_clock GL_ARB_shader_draw_parameters GL_ARB_shader_group_vote GL_ARB_shader_image_load_store GL_ARB_shader_image_size GL_ARB_shader_objects GL_ARB_shader_precision GL_ARB_shader_storage_buffer_object GL_ARB_shader_texture_image_samples GL_ARB_shader_texture_lod GL_ARB_shading_language_100 GL_ARB_shading_language_420pack GL_ARB_shading_language_packing GL_ARB_shadow GL_ARB_sync GL_ARB_texture_barrier GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_compression_bptc GL_ARB_texture_compression_rgtc GL_ARB_texture_cube_map GL_ARB_texture_cube_map_array GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_filter_anisotropic GL_ARB_texture_float GL_ARB_texture_gather GL_ARB_texture_mirror_clamp_to_edge GL_ARB_texture_mirrored_repeat GL_ARB_texture_multisample GL_ARB_texture_non_power_of_two GL_ARB_texture_query_levels GL_ARB_texture_query_lod GL_ARB_texture_rectangle GL_ARB_texture_rg GL_ARB_texture_rgb10_a2ui GL_ARB_texture_storage GL_ARB_texture_storage_multisample GL_ARB_texture_swizzle GL_ARB_texture_view GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_transform_feedback_instanced GL_ARB_transform_feedback_overflow_query GL_ARB_transpose_matrix GL_ARB_uniform_buffer_object GL_ARB_vertex_array_bgra GL_ARB_vertex_array_object GL_ARB_vertex_attrib_binding GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_vertex_type_10f_11f_11f_rev GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_window_pos GL_ATI_blend_equation_separate GL_ATI_draw_buffers GL_ATI_separate_stencil GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_compiled_vertex_array GL_EXT_copy_texture GL_EXT_draw_buffers2 GL_EXT_draw_instanced GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_framebuffer_object GL_EXT_framebuffer_sRGB GL_EXT_gpu_program_parameters GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_packed_pixels GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_polygon_offset GL_EXT_polygon_offset_clamp GL_EXT_provoking_vertex GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shader_integer_mix GL_EXT_shader_samples_identical GL_EXT_shadow_funcs GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_subtexture GL_EXT_texture GL_EXT_texture3D GL_EXT_texture_array GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_rgtc GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_add GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_lod_bias GL_EXT_texture_object GL_EXT_texture_rectangle GL_EXT_texture_sRGB GL_EXT_texture_sRGB_decode GL_EXT_texture_shared_exponent GL_EXT_texture_snorm GL_EXT_texture_swizzle GL_EXT_timer_query GL_EXT_transform_feedback GL_EXT_vertex_array GL_EXT_vertex_array_bgra GL_IBM_multimode_draw_arrays GL_IBM_rasterpos_clip GL_IBM_texture_mirrored_repeat GL_INGR_blend_func_separate GL_INTEL_performance_query GL_KHR_blend_equation_advanced GL_KHR_context_flush_control GL_KHR_debug GL_KHR_no_error GL_KHR_robustness GL_MESA_pack_invert GL_MESA_shader_integer_functions GL_MESA_texture_signed_rgba GL_MESA_window_pos GL_NV_blend_square GL_NV_conditional_render GL_NV_depth_clamp GL_NV_light_max_exponent GL_NV_packed_depth_stencil GL_NV_primitive_restart GL_NV_texgen_reflection GL_NV_texture_barrier GL_NV_texture_env_combine4 GL_NV_texture_rectangle GL_OES_EGL_image GL_OES_read_format GL_S3_s3tc GL_SGIS_generate_mipmap GL_SGIS_texture_border_clamp GL_SGIS_texture_edge_clamp GL_SGIS_texture_lod GL_SUN_multi_draw_arrays
Disabled Extensions	GL_ARB_timer_query GL_EXT_timer_query GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent
Disabled WebGL Extensions	EXT_disjoint_timer_query EXT_disjoint_timer_query_webgl2
Window system binding vendor	SGI
Window system binding version	1.4
Window system binding extensions	GLX_ARB_create_context GLX_ARB_create_context_profile GLX_ARB_create_context_robustness GLX_ARB_fbconfig_float GLX_ARB_framebuffer_sRGB GLX_ARB_multisample GLX_EXT_create_context_es_profile GLX_EXT_create_context_es2_profile GLX_EXT_fbconfig_packed_float GLX_EXT_framebuffer_sRGB GLX_EXT_import_context GLX_EXT_libglvnd GLX_EXT_texture_from_pixmap GLX_EXT_visual_info GLX_EXT_visual_rating GLX_MESA_copy_sub_buffer GLX_OML_swap_method GLX_SGI_make_current_read GLX_SGI_swap_control GLX_SGIS_multisample GLX_SGIX_fbconfig GLX_SGIX_pbuffer GLX_SGIX_visual_select_group GLX_INTEL_swap_event
Window manager	Xfwm4
XDG_CURRENT_DESKTOP	XFCE
GDMSESSION	xfce
Compositing manager	Yes
Direct rendering	Yes
Reset notification strategy	0x8261
GPU process crash count	0
System visual ID	33
RGBA visual ID	306
Compositor Information
Tile Update Mode	One-copy
Partial Raster	Enabled
GpuMemoryBuffers Status
ATC	Software only
ATCIA	Software only
DXT1	Software only
DXT5	Software only
ETC1	Software only
R_8	Software only
R_16	Software only
RG_88	Software only
BGR_565	Software only
RGBA_4444	Software only
RGBX_8888	Software only
RGBA_8888	Software only
BGRX_8888	Software only
BGRX_1010102	Software only
RGBX_1010102	Software only
BGRA_8888	Software only
RGBA_F16	Software only
YVU_420	Software only
YUV_420_BIPLANAR	Software only
UYVY_422	Software only
Display(s) Information
Info	Display[1881264395124802] bounds=[0,0 1366x768], workarea=[0,24 1366x744], scale=1, external.
Color space information	{primaries:INVALID, transfer:INVALID, matrix:INVALID, range:INVALID}
Bits per color component	8
Bits per pixel	24
Video Acceleration Information
Log Messages
[2286:2286:0926/183616.601694:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x11460f3dd300]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE
[2286:2286:0926/183839.676964:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x11460f2b8300]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE
[2286:2286:0926/183935.519186:ERROR:gles2_cmd_decoder.cc(10162)] : [.WebGL-0x11460f2b8300]RENDER WARNING: there is no texture bound to the unit 0
[2286:2286:0926/183935.521539:ERROR:gles2_cmd_decoder.cc(10162)] : [.WebGL-0x11460f2b8300]RENDER WARNING: there is no texture bound to the unit 0
[2286:2286:0926/184535.276689:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x1661228dce00]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2286:2286:0926/184535.277212:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x1661228dce00]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/184633.422406:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x11460f5b9000]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE
[2286:2286:0926/184641.254805:ERROR:gles2_cmd_decoder.cc(10162)] : [.WebGL-0x11460f5b9000]RENDER WARNING: there is no texture bound to the unit 0
[2286:2286:0926/184641.257086:ERROR:gles2_cmd_decoder.cc(10162)] : [.WebGL-0x11460f5b9000]RENDER WARNING: there is no texture bound to the unit 0
[2286:2286:0926/184904.167004:ERROR:buffer_manager.cc(491)] : [.BrowserCompositor-0x16611a1e5100]GL ERROR :GL_INVALID_OPERATION : glBufferData: <- error from previous GL command
[2286:2286:0926/191700.693886:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x16612953f700]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2286:2286:0926/191700.693934:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x16612953f700]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/192344.874498:ERROR:buffer_manager.cc(491)] : [.BrowserCompositor-0x166129540500]GL ERROR :GL_INVALID_OPERATION : glBufferData: <- error from previous GL command
[2286:2286:0926/192911.998666:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x16611c7b2300]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2286:2286:0926/192911.999127:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x16611c7b2300]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/194709.513736:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x16611972aa00]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2286:2286:0926/194709.514882:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x16611972aa00]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/200105.930292:ERROR:buffer_manager.cc(491)] : [.BrowserCompositor-0x166129070000]GL ERROR :GL_INVALID_OPERATION : glBufferData: <- error from previous GL command
[2286:2286:0926/200342.816177:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x16611a8c9500]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2286:2286:0926/200342.816328:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x16611a8c9500]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/201916.862841:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x1146103c0700]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE
[2286:2286:0926/202015.912557:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x16611c7b1c00]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2286:2286:0926/202015.912616:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x16611c7b1c00]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/202604.435874:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x16611de4ee00]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2286:2286:0926/202604.435940:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x16611de4ee00]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/202645.443998:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x16611c7ba500]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2286:2286:0926/202645.445009:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x16611c7ba500]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/203521.125058:ERROR:buffer_manager.cc(491)] : [.BrowserCompositor-0x16611ec01800]GL ERROR :GL_INVALID_OPERATION : glBufferData: <- error from previous GL command
[2286:2286:0926/203715.484413:ERROR:buffer_manager.cc(491)] : [.BrowserCompositor-0x166120c1ea00]GL ERROR :GL_INVALID_OPERATION : glBufferData: <- error from previous GL command
[2286:2286:0926/203732.799702:ERROR:buffer_manager.cc(491)] : [.BrowserCompositor-0x166120c34700]GL ERROR :GL_INVALID_OPERATION : glBufferData: <- error from previous GL command
[2286:2286:0926/203929.558023:ERROR:buffer_manager.cc(491)] : [.BrowserCompositor-0x1661197c8100]GL ERROR :GL_INVALID_OPERATION : glBufferData: <- error from previous GL command
[2286:2286:0926/204011.787747:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x166129070e00]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2286:2286:0926/204011.788847:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x166129070e00]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/204355.576821:ERROR:buffer_manager.cc(491)] : [.BrowserCompositor-0x16612a61e800]GL ERROR :GL_INVALID_OPERATION : glBufferData: <- error from previous GL command
[2286:2286:0926/205546.859461:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x11461020c300]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE
[2286:2286:0926/210029.995944:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x11460f53bc00]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE
[2286:2286:0926/210125.031369:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x11460f58e000]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE
[2286:2286:0926/210255.145360:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x16612a61c500]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2286:2286:0926/210255.145490:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x16612a61c500]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/210255.159201:ERROR:gles2_cmd_decoder.cc(10168)] : [.BrowserCompositor-0x16612a61c500]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering.
[2286:2286:0926/211133.379826:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x11460f5b5c00]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE
[2286:2286:0926/211236.624914:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x11460f8d8e00]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE
[2286:2286:0927/062224.455468:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x11460f58d700]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE
[2286:2286:0927/062242.532106:ERROR:gles2_cmd_decoder_autogen.h(1606)] : [.WebGL-0x11460fec5700]GL ERROR :GL_INVALID_ENUM : glGetIntegerv: pname was GL_MAX_SAMPLES_ANGLE

Dimming the display after X seconds or minutes is a feature provided by my desktop environment Xfce and many other other desktop environments and window managers. 

It's a useful feature that most users want enabled by default to save battery. 

It would be good if Chromium could automatically inhibit this dimming when it's playing a video. 

I think Firefox 58 and above has a similar feature [1].

Looking forward to your thoughts and feedback.

Yours

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1398539
 

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