Same issue happens to me, except I noticed it when full-screening YouTube TV on my second monitor, and it was my primary monitor which was blacked out. This is an old problem I've seen in previous versions of Chrome, but hadn't seen in quite some time. It happened immediately after upgrading to Chrome 69 and launching YTTV.

Here's my system details:


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: Hardware accelerated
Out-of-process Rasterization: Unavailable
Hardware Protected Video Decode: Unavailable
Rasterization: Unavailable
Skia Deferred Display List: Disabled
Skia Renderer: Disabled
Surface Synchronization: Enabled
Video Decode: Hardware accelerated
Viz Service Display Compositor: Disabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
Driver Bug Workarounds
adjust_src_dst_region_for_blitframebuffer
decode_encode_srgb_for_generatemipmap
disable_2d_canvas_auto_flush
disable_av_sample_buffer_display_layer
disable_framebuffer_cmaa
get_frag_data_info_bug
pack_parameters_workaround_with_pack_buffer
regenerate_struct_names
remove_invariant_and_centroid_for_essl3
reset_base_mipmap_level_before_texstorage
scalarize_vec_and_mat_constructor_args
set_zero_level_before_generating_mipmap
unfold_short_circuit_as_ternary_operation
unpack_alignment_workaround_with_unpack_buffer
use_intermediary_for_copy_texture_image
use_shadowed_tex_level_params
use_unused_standard_shared_blocks
Problems Detected
Some GPUs on Mac can perform poorly with GPU rasterization. Disable all known AMD GPUs other than the R200, R300, and D series, which have been tested.: 613272, 614468
Disabled Features: gpu_rasterization
Protected video decoding with swap chain is for Windows and Intel only
Disabled Features: protected_video_decode
Unfold short circuit on Mac OS X: 307751
Applied Workarounds: unfold_short_circuit_as_ternary_operation
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args
Mac drivers handle struct scopes incorrectly: 403957
Applied Workarounds: regenerate_struct_names
glGenerateMipmap fails if the zero texture level is not set on some Mac drivers: 560499
Applied Workarounds: set_zero_level_before_generating_mipmap
Pack parameters work incorrectly with pack buffer bound: 563714
Applied Workarounds: pack_parameters_workaround_with_pack_buffer
Alignment works incorrectly with unpack buffer bound: 563714
Applied Workarounds: unpack_alignment_workaround_with_unpack_buffer
copyTexImage2D fails when reading from IOSurface on multiple GPU types.: 581777
Applied Workarounds: use_intermediary_for_copy_texture_image
Mac Drivers store texture level parameters on int16_t that overflow: 610153
Applied Workarounds: use_shadowed_tex_level_params
Use GL_INTEL_framebuffer_CMAA on ChromeOS: 535198
Applied Workarounds: disable_framebuffer_cmaa
glGetFragData{Location|Index} works incorrectly on Max: 638340
Applied Workarounds: get_frag_data_info_bug
glTexStorage* are buggy when base mipmap level is not 0: 640506
Applied Workarounds: reset_base_mipmap_level_before_texstorage
Decode and encode before generateMipmap for srgb format textures on macosx: 634519
Applied Workarounds: decode_encode_srgb_for_generatemipmap
Insert statements to reference all members in unused std140/shared blocks on Mac: 618464
Applied Workarounds: use_unused_standard_shared_blocks
adjust src/dst region if blitting pixels outside read framebuffer on Mac: 644740
Applied Workarounds: adjust_src_dst_region_for_blitframebuffer
Mac driver GL 4.1 requires invariant and centroid to match between shaders: 639760, 641129
Applied Workarounds: remove_invariant_and_centroid_for_essl3
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)
Fullscreen video crashes macOS 10.11 WindowServer.: 806506
Applied Workarounds: disable_av_sample_buffer_display_layer
Don't expose disjoint_timer_query extensions to WebGL: 808744
glFlush error on Mac: 841755
Applied Workarounds: disable_2d_canvas_auto_flush
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	2018-09-06T04:00:44.237Z
Chrome version	Chrome/69.0.3497.81
Operating system	Mac OS X 10.11.6
Software rendering list URL	https://chromium.googlesource.com/chromium/src/+/032b3ca19e9af20182f9bd03deefc0faf4695558/gpu/config/software_rendering_list.json
Driver bug list URL	https://chromium.googlesource.com/chromium/src/+/032b3ca19e9af20182f9bd03deefc0faf4695558/gpu/config/gpu_driver_bug_list.json
ANGLE commit id	6ffc489d4f18
2D graphics backend	Skia/69 e110fd1ebd2d559838c49a8821ebf18986bd6ec2-
Command Line	/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --flag-switches-begin --flag-switches-end
Driver Information
Initialization time	10
In-process GPU	false
Passthrough Command Decoder	false
Sandboxed	true
GPU0	VENDOR = 0x1002 [ATI Technologies Inc.], DEVICE= 0x68a1 [ATI Radeon HD 5750 OpenGL Engine] *ACTIVE*
Optimus	false
AMD switchable	false
Driver vendor	ATI
Driver version	1.42.15
Driver date	
Pixel shader version	4.10
Vertex shader version	4.10
Max. MSAA samples	8
Machine model name	iMac
Machine model version	11.3
GL_VENDOR	ATI Technologies Inc.
GL_RENDERER	ATI Radeon HD 5750 OpenGL Engine
GL_VERSION	4.1 ATI-1.42.15
GL_EXTENSIONS	GL_ARB_blend_func_extended GL_ARB_draw_buffers_blend GL_ARB_draw_indirect GL_ARB_ES2_compatibility GL_ARB_explicit_attrib_location GL_ARB_gpu_shader5 GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_occlusion_query2 GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_separate_shader_objects GL_ARB_shader_bit_encoding GL_ARB_shader_subroutine GL_ARB_shading_language_include GL_ARB_tessellation_shader GL_ARB_texture_buffer_object_rgb32 GL_ARB_texture_cube_map_array GL_ARB_texture_gather GL_ARB_texture_query_lod GL_ARB_texture_rgb10_a2ui GL_ARB_texture_storage GL_ARB_texture_swizzle GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_texture_compression_s3tc GL_EXT_texture_filter_anisotropic GL_EXT_texture_mirror_clamp GL_EXT_texture_sRGB_decode GL_APPLE_client_storage GL_APPLE_container_object_shareable GL_APPLE_flush_render GL_APPLE_object_purgeable GL_APPLE_rgb_422 GL_APPLE_row_bytes GL_APPLE_texture_range GL_ATI_texture_mirror_once GL_NV_texture_barrier
Disabled Extensions	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	
Window system binding version	
Window system binding extensions	
Direct rendering	Yes
Reset notification strategy	0x0000
GPU process crash count	0
Compositor Information
Tile Update Mode	Zero-copy
Partial Raster	Enabled
GpuMemoryBuffers Status
ATC	Software only
ATCIA	Software only
DXT1	Software only
DXT5	Software only
ETC1	Software only
R_8	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
R_16	Software only
RG_88	Software only
BGR_565	Software only
RGBA_4444	Software only
RGBX_8888	Software only
RGBA_8888	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
BGRX_8888	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE
BGRX_1010102	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
RGBX_1010102	Software only
BGRA_8888	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
RGBA_F16	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
YVU_420	Software only
YUV_420_BIPLANAR	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
UYVY_422	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
Display(s) Information
Info	Display[69678528] bounds=[0,0 1920x1080], workarea=[0,23 1920x1053], scale=1, external.
Color space information	{primaries_d50_referred: [[0.6501, 0.3369], [0.3172, 0.6126], [0.1500, 0.0508]], transfer:0.0777*x + 0.0000 if x < 0.0450 else (0.9478*x + 0.0521)**2.4000 + -0.0000, matrix:RGB, range:FULL}
Bits per color component	8
Bits per pixel	24
Info	Display[1317019841] bounds=[-1366,0 1366x768], workarea=[-1366,0 1366x768], scale=1, external.
Color space information	{primaries_d50_referred: [[0.6511, 0.3355], [0.3319, 0.5989], [0.1562, 0.0755]], transfer:0.0777*x + 0.0000 if x < 0.0450 else (0.9478*x + 0.0521)**2.4000 + -0.0000, matrix:RGB, range:FULL}
Bits per color component	8
Bits per pixel	24
Video Acceleration Information
Log Messages
[2582:775:0905/204849.053547:ERROR:gles2_cmd_decoder.cc(18047)] : [.BrowserCompositor-0x7ff1b9b06e00]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[2582:775:0905/204849.053602:ERROR:gles2_cmd_decoder.cc(12520)] : [.BrowserCompositor-0x7ff1b9b06e00]GL ERROR :GL_INVALID_VALUE : glScheduleCALayerCHROMIUM: unsupported texture format
[2582:775:0905/204858.881168:ERROR:gles2_cmd_decoder.cc(12689)] : [.RenderCompositor-0x7f9a63013e00]GL ERROR :GL_INVALID_VALUE : glSetColorSpaceMetadataCHROMIUM: no image associated with texture
[2582:775:0905/204858.881274:ERROR:gles2_cmd_decoder.cc(12689)] : [.RenderCompositor-0x7f9a63013e00]GL ERROR :GL_INVALID_VALUE : glSetColorSpaceMetadataCHROMIUM: no image associated with texture

Unable to reproduce the issue on chrome version# 69.0.3497.81 using Mac 10.12.6 with steps mentioned below:
1) Launched chrome reported version on Mac 10.12.6(primary screen) and connected a second monitor as HP
2) Opened YouTube, played a video and made it to full screen on primary monitor, didn't seen second monitor blacks out
Observations: Also tried testing the issue by playing and making the video to full screen on second monitor, but didn't observed primary monitor blacks out.
Note: Unable to provide the screencast of the issue with combination of primary and second monitor.

@Reporter: Please find the above information and let us know if we missed anything in reproducing the issue. Try to test this issue by creating new person with no apps and extensions in it and let us know if the issue still persists.

Thanks!

Black screen issue too.
dual monitor / devtools on second screen for debugging web page (no video in web page).
Windows 10 x64 / Chrome #69.0.3497.81
Monitor 1 : 1920*1080 Monitor 2 : 1920*1080

It's never happen in Chrome 68. 

Black screen happen during 2 sec then come back to normal and randomly redo.


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: Hardware accelerated
Skia Deferred Display List: Disabled
Skia Renderer: Disabled
Surface Synchronization: Enabled
Video Decode: Software only. Hardware acceleration disabled
Viz Service Display Compositor: Disabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
Driver Bug Workarounds
clear_uniforms_before_first_program_use
decode_encode_srgb_for_generatemipmap
disable_delayed_copy_nv12
disable_discard_framebuffer
disable_framebuffer_cmaa
exit_on_context_lost
force_cube_complete
scalarize_vec_and_mat_constructor_args
texsubimage_faster_than_teximage
Problems Detected
Protected video decoding with swap chain is for Windows and Intel only
Disabled Features: protected_video_decode
Some drivers are unable to reset the D3D device in the GPU process sandbox
Applied Workarounds: exit_on_context_lost
TexSubImage is faster for full uploads on ANGLE
Applied Workarounds: texsubimage_faster_than_teximage
Clear uniforms before first program use on all platforms: 124764, 349137
Applied Workarounds: clear_uniforms_before_first_program_use
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args
ANGLE crash on glReadPixels from incomplete cube map texture: 518889
Applied Workarounds: force_cube_complete
Framebuffer discarding can hurt performance on non-tilers: 570897
Applied Workarounds: disable_discard_framebuffer
Use GL_INTEL_framebuffer_CMAA on ChromeOS: 535198
Applied Workarounds: disable_framebuffer_cmaa
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)
Decode and Encode before generateMipmap for srgb format textures on Windows: 634519
Applied Workarounds: decode_encode_srgb_for_generatemipmap
Delayed copy NV12 displays incorrect colors on NVIDIA drivers.: 728670
Applied Workarounds: disable_delayed_copy_nv12
Don't expose disjoint_timer_query extensions to WebGL: 808744
Accelerated video decode has been disabled, either via blacklist, about:flags or the command line.
Disabled Features: video_decode
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	2018-09-06T07:54:44.015Z
Chrome version	Chrome/69.0.3497.81
Operating system	Windows NT 10.0.17134
Software rendering list URL	https://chromium.googlesource.com/chromium/src/+/032b3ca19e9af20182f9bd03deefc0faf4695558/gpu/config/software_rendering_list.json
Driver bug list URL	https://chromium.googlesource.com/chromium/src/+/032b3ca19e9af20182f9bd03deefc0faf4695558/gpu/config/gpu_driver_bug_list.json
ANGLE commit id	6ffc489d4f18
2D graphics backend	Skia/69 e110fd1ebd2d559838c49a8821ebf18986bd6ec2-
Command Line	"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --disk-cache-dir="B:\chrome" --flag-switches-begin --disable-accelerated-video-decode --enable-devtools-experiments --flag-switches-end
Driver Information
Initialization time	259
In-process GPU	false
Passthrough Command Decoder	true
Sandboxed	true
GPU0	VENDOR = 0x10de [Google Inc.], DEVICE= 0x104c [ANGLE (NVIDIA GeForce GT 705 Direct3D11 vs_5_0 ps_5_0)] *ACTIVE*
Optimus	false
AMD switchable	false
Desktop compositing	Aero Glass
Direct Composition	true
Supports overlays	false
Overlay capabilities
Diagonal Monitor Size of \\.\DISPLAY2	23.5"
Diagonal Monitor Size of \\.\DISPLAY1	21.5"
Driver D3D12 feature level	Not supported
Driver Vulkan API version	Not supported
Driver vendor	NVIDIA
Driver version	23.21.13.8795
Driver date	10-9-2017
Pixel shader version	5.0
Vertex shader version	5.0
Max. MSAA samples	8
Machine model name	
Machine model version	
GL_VENDOR	Google Inc.
GL_RENDERER	ANGLE (NVIDIA GeForce GT 705 Direct3D11 vs_5_0 ps_5_0)
GL_VERSION	OpenGL ES 2.0 (ANGLE 2.1.0.6ffc489d4f18)
GL_EXTENSIONS	GL_ANGLE_client_arrays GL_ANGLE_depth_texture GL_ANGLE_explicit_context GL_ANGLE_explicit_context_gles1 GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_pack_reverse_row_order GL_ANGLE_program_cache_control GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_color_buffer_float_rgb GL_CHROMIUM_color_buffer_float_rgba GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_minmax GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_frag_depth GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_KHR_parallel_shader_compile GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context 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_array_object OES_compressed_EAC_R11_signed_texture OES_compressed_EAC_R11_unsigned_texture OES_compressed_EAC_RG11_signed_texture OES_compressed_EAC_RG11_unsigned_texture OES_compressed_ETC2_RGB8_texture OES_compressed_ETC2_RGBA8_texture OES_compressed_ETC2_punchthroughA_RGBA8_texture OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture OES_compressed_ETC2_sRGB8_alpha8_texture OES_compressed_ETC2_sRGB8_texture
Disabled Extensions	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	Google Inc. (adapter LUID: 000000000000960a)
Window system binding version	1.4 (ANGLE 2.1.0.6ffc489d4f18)
Window system binding extensions	EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_CHROMIUM_sync_control EGL_EXT_pixel_format_float EGL_KHR_surfaceless_context EGL_ANGLE_display_texture_share_group EGL_ANGLE_create_context_client_arrays EGL_ANGLE_program_cache_control EGL_ANGLE_robust_resource_initialization EGL_ANGLE_create_context_extensions_enabled
Direct rendering	Yes
Reset notification strategy	0x8252
GPU process crash count	0
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	GPU_READ, SCANOUT
RGBA_8888	GPU_READ, SCANOUT
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[2528732444] bounds=[1920,0 1920x1080], workarea=[1920,0 1920x1040], scale=1, external.
Color space information	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Bits per color component	8
Bits per pixel	24
Info	Display[2779098405] bounds=[0,0 1920x1080], workarea=[0,0 1920x1040], scale=1, external.
Color space information	{primaries_d50_referred: [[0.6524, 0.3321], [0.3438, 0.6147], [0.1599, 0.0757]], transfer:0.0000*x + 0.0000 if x < 0.0000 else (1.0000*x + 0.0000)**2.1992 + 0.0000, matrix:RGB, range:FULL}
Bits per color component	8
Bits per pixel	24
Video Acceleration Information
Encode h264 baseline	up to 3840x2176 pixels and/or 30.000 fps
Encode h264 main	up to 3840x2176 pixels and/or 30.000 fps
Encode h264 high	up to 3840x2176 pixels and/or 30.000 fps
Diagnostics
0
b3DAccelerationEnabled	true
b3DAccelerationExists	true
bAGPEnabled	true
bAGPExistenceValid	true
bAGPExists	true
bCanRenderWindow	true
bDDAccelerationEnabled	true
bDriverBeta	false
bDriverDebug	false
bDriverSigned	false
bDriverSignedValid	false
bNoHardware	false
dwBpp	32
dwDDIVersion	12
dwHeight	1080
dwRefreshRate	60
dwWHQLLevel	0
dwWidth	1920
iAdapter	1
lDriverSize	944856
lMiniVddSize	0
szAGPStatusEnglish	Enabled
szAGPStatusLocalized	Activé
szChipType	GeForce GT 705
szD3DStatusEnglish	Enabled
szD3DStatusLocalized	Activé
szDACType	Integrated RAMDAC
szDDIVersionEnglish	12
szDDIVersionLocalized	12
szDDStatusEnglish	Enabled
szDDStatusLocalized	Activé
szDXVAHDEnglish	Supported
szDXVAModes	ModeMPEG2_A ModeMPEG2_C ModeVC1_C ModeWMV9_C
szDescription	NVIDIA GeForce GT 705
szDeviceId	0x104C
szDeviceIdentifier	{D7B71E3E-530C-11CF-C351-96301BC2DA35}
szDeviceName	\\.\DISPLAY1
szDisplayMemoryEnglish	10168 MB
szDisplayMemoryLocalized	10168 MB
szDisplayModeEnglish	1920 x 1080 (32 bit) (60Hz)
szDisplayModeLocalized	1920 x 1080 (32 bit) (60Hz)
szDriverAssemblyVersion	23.21.13.8795
szDriverAttributes	Final Retail
szDriverDateEnglish	09/10/2017 02:00:00
szDriverDateLocalized	10/9/2017 02:00:00
szDriverLanguageEnglish	English
szDriverLanguageLocalized	Anglais
szDriverModelEnglish	WDDM 2.3
szDriverModelLocalized	WDDM 2.3
szDriverName	C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_7300df58eef97871\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_7300df58eef97871\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_7300df58eef97871\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_7300df58eef97871\nvldumdx.dll
szDriverNodeStrongName	oem54.inf:0f066de300f55042:Section018:23.21.13.8795:pci\ven_10de&dev_104c&subsys_109b1028
szDriverSignDate	Unknown
szDriverVersion	23.21.0013.8795
szKeyDeviceID	Enum\PCI\VEN_10DE&DEV_104C&SUBSYS_109B1028&REV_A1
szKeyDeviceKey	\Registry\Machine\System\CurrentControlSet\Control\Video\{FF00D897-624B-11E8-9809-D6E42CF7AD12}\0000
szManufacturer	NVIDIA
szMiniVdd	inconnu
szMiniVddDateEnglish	Unknown
szMiniVddDateLocalized	inconnu
szMonitorMaxRes	Unknown
szMonitorName	Generic PnP Monitor
szNotesEnglish	No problems found.
szNotesLocalized	Aucun problème n’a été détecté.
szOverlayEnglish	Supported
szRankOfInstalledDriver	00D10001
szRegHelpText	Unknown
szRevision	Unknown
szRevisionId	0x00A1
szSubSysId	0x109B1028
szTestResultD3D7English	Not run
szTestResultD3D7Localized	Non exécuté
szTestResultD3D8English	Not run
szTestResultD3D8Localized	Non exécuté
szTestResultD3D9English	Not run
szTestResultD3D9Localized	Non exécuté
szTestResultDDEnglish	Not run
szTestResultDDLocalized	Non exécuté
szVdd	inconnu
szVendorId	0x10DE
1
b3DAccelerationEnabled	true
b3DAccelerationExists	true
bAGPEnabled	true
bAGPExistenceValid	true
bAGPExists	true
bCanRenderWindow	true
bDDAccelerationEnabled	true
bDriverBeta	false
bDriverDebug	false
bDriverSigned	false
bDriverSignedValid	false
bNoHardware	false
dwBpp	32
dwDDIVersion	12
dwHeight	1080
dwRefreshRate	60
dwWHQLLevel	0
dwWidth	1920
iAdapter	0
lDriverSize	944856
lMiniVddSize	0
szAGPStatusEnglish	Enabled
szAGPStatusLocalized	Activé
szChipType	GeForce GT 705
szD3DStatusEnglish	Enabled
szD3DStatusLocalized	Activé
szDACType	Integrated RAMDAC
szDDIVersionEnglish	12
szDDIVersionLocalized	12
szDDStatusEnglish	Enabled
szDDStatusLocalized	Activé
szDXVAHDEnglish	Supported
szDXVAModes	ModeMPEG2_A ModeMPEG2_C ModeVC1_C ModeWMV9_C
szDescription	NVIDIA GeForce GT 705
szDeviceId	0x104C
szDeviceIdentifier	{D7B71E3E-530C-11CF-C351-96301BC2DA35}
szDeviceName	\\.\DISPLAY2
szDisplayMemoryEnglish	10168 MB
szDisplayMemoryLocalized	10168 MB
szDisplayModeEnglish	1920 x 1080 (32 bit) (60Hz)
szDisplayModeLocalized	1920 x 1080 (32 bit) (60Hz)
szDriverAssemblyVersion	23.21.13.8795
szDriverAttributes	Final Retail
szDriverDateEnglish	09/10/2017 02:00:00
szDriverDateLocalized	10/9/2017 02:00:00
szDriverLanguageEnglish	English
szDriverLanguageLocalized	Anglais
szDriverModelEnglish	WDDM 2.3
szDriverModelLocalized	WDDM 2.3
szDriverName	C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_7300df58eef97871\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_7300df58eef97871\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_7300df58eef97871\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_7300df58eef97871\nvldumdx.dll
szDriverNodeStrongName	oem54.inf:0f066de300f55042:Section018:23.21.13.8795:pci\ven_10de&dev_104c&subsys_109b1028
szDriverSignDate	Unknown
szDriverVersion	23.21.0013.8795
szKeyDeviceID	Enum\PCI\VEN_10DE&DEV_104C&SUBSYS_109B1028&REV_A1
szKeyDeviceKey	\Registry\Machine\System\CurrentControlSet\Control\Video\{FF00D897-624B-11E8-9809-D6E42CF7AD12}\0001
szManufacturer	NVIDIA
szMiniVdd	inconnu
szMiniVddDateEnglish	Unknown
szMiniVddDateLocalized	inconnu
szMonitorMaxRes	Unknown
szMonitorName	ViewSonic VA2445 SERIES
szNotesEnglish	No problems found.
szNotesLocalized	Aucun problème n’a été détecté.
szOverlayEnglish	Supported
szRankOfInstalledDriver	00D10001
szRegHelpText	Unknown
szRevision	Unknown
szRevisionId	0x00A1
szSubSysId	0x109B1028
szTestResultD3D7English	Not run
szTestResultD3D7Localized	Non exécuté
szTestResultD3D8English	Not run
szTestResultD3D8Localized	Non exécuté
szTestResultD3D9English	Not run
szTestResultD3D9Localized	Non exécuté
szTestResultDDEnglish	Not run
szTestResultDDLocalized	Non exécuté
szVdd	inconnu
szVendorId	0x10DE
Log Messages
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.
GpuProcessHostUIShim:
GpuProcessHostUIShim:
GpuProcessHostUIShim:
[15772:5808:0906/094631.242:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.

PLEASE NOTE: this only happens when "Displays have separate spaces" is turned off in the system preferences. 

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

=>ccameron and P1 given the rapid number of stars this is accumulating.

+ellyjones as FYI

Could someone please attach a cellphone video of this happening, so that we can try to reproduce it on our end

As per comment# 10 adding Needs-Feedback label.

Could someone who are facing the issue can please respond to comment# 10 by providing the video which helps in understanding the issue.

Thanks!

I finally find a way to automatically reproduce the black screen with dev tools.

It's not working in all website but for example .
If you go on www.boursorama.com (i can reproduce this bug every time in this web page the main one)
Right click on web page => Inspect element then go on the body element.
the web page turn in light blue (hovered element) 
And if you monitor task in win10 you will see memory usage increasing fastly (and GPU usage climbing up to 55%) until memory is full when it's full black screen and revive after 2 seconds.


Looks like memory leak issue 

Why are we talking about Windows 10? This sounds like a second, different bug, than the one I reported, which is for Mac OS X with two monitors. The video plays fine in full screen mode on the first monitor, but the second monitor gets completely blacked out. This is NOT an issue where the original monitor goes black but then restores after a few seconds.

Re #14, no, this but is for macOS only.

This is a change in fullscreen behavior with MacViews and spaces -- this isn't a GPU issue. Sending to ellyjones to triage.

To repro:
- un-click "Displays have separate Spaces"
- play any video, go fullscreen

I've attached
- a picture of the setting
- a video of TOT with MacViews vs Cocoa

Deleted: settings.png 115 KB

	settings.png 115 KB View Download

Deleted: cocoa.mov 4.2 MB

	cocoa.mov 4.2 MB View Download

Deleted: views.mov 2.3 MB

	views.mov 2.3 MB View Download

... and ... this makes Chrome's behavior consistent with QuickTime and Safari (see attached videos).

So my opinion is this should probably be WontFix.

Deleted: quicktime.mov 3.3 MB

	quicktime.mov 3.3 MB View Download

Deleted: safari.mov 3.4 MB

	safari.mov 3.4 MB View Download

If the motivation is to stay consistent with the native behavior that's okay.
I believe that you should give at least the option to disable this behavior since it has been the default way forever.
For example, VLC has the same default native behavior as quicktime and a simple toggle in settings to disable it.

This is definitely a regression of  Issue 582944 . It was reported and fixed in 2016 but has reappeared in Version 69.0.3497.100 (Official Build) (64-bit)

It's definitely not okay and I really don't think "consistent" bad UX should be a goal. The "native" way is an abomination rendering my second display useless (who in their right mind at Apple thought it was a good idea to begin with?!), and I really can't see the point of "displays have separate spaces" except as a workaround to the accumulated UX debt in OSX over the years. Please Chromium team, don't throw as to the Lions (see what I did there?)

ccameron@, how hard would it be to implement the old behavior, if we did want to add a setting?

I'll chat with the product folks about whether we actually should do this.

There is no chance this will be fixed in 72 or earlier though.

I don't know offhand how the systems were implemented. I would suspect it's a small change.

I'd just like to chime in (apparently I don't reboot my machine, or chrome, for multiple weeks at a time) that I'm definitely missing the 'non-native' fullscreen. It's actually more distracting the native way, as I've got a messenger client on a second monitor. If someone messages me while watching a video, I get a bouncing dock icon popping into the video - and the only way to remove it is to exit fullscreen and switch to the other app. Used to be I could just click the other app in the second monitor, while leaving the video fullscreen on the main monitor.