Chrome Version: 68.0.3401.0
Chrome OS Version: R68-10601.0.0
Chrome OS Platform: Eve
<b>Network info: <network, encryption type, router model (if known)></b>

Please specify Cr-* of the system to which this bug/feature applies (add
the label below).

Steps To Reproduce:
(1) Install canary R68-10601.0.0
(2)
(3)

Expected Result:
No graphical corruption/glitches

Actual Result:
Black glitches appear when screen is refreshed on login screen. Mild sluggishness of graphics. UI elements flash white after logging in as guest, for example, and scrolling around settings.

Typing causes a noticeable lag in letters appearing.

How frequently does this problem reproduce? (Always, sometimes, hard to
reproduce?)
Always

What is the impact to the user, and is there a workaround? If so, what is
it?
Looks bad, feels bad.

Please provide any additional information below. Attach a screen shot or
log if possible.

For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.
Graphics Feature Status

Canvas: Hardware accelerated
CheckerImaging: Disabled
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Native GpuMemoryBuffers: Hardware accelerated
Rasterization: Hardware accelerated
Surface Synchronization: Enabled
Video Decode: Hardware accelerated
Viz Service Display Compositor: Disabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated

Driver Bug Workarounds

clear_uniforms_before_first_program_use
count_all_in_varyings_packing
decode_encode_srgb_for_generatemipmap
disable_discard_framebuffer
msaa_is_slow
rely_on_implicit_sync_for_swap_buffers
scalarize_vec_and_mat_constructor_args

Problems Detected

Framebuffer discarding causes jumpy scrolling on Mali drivers: 301988
Applied Workarounds: disable_discard_framebuffer
Clear uniforms before first program use on all platforms: 124764, 349137
Applied Workarounds: clear_uniforms_before_first_program_use
Mesa drivers in ChromeOS handle varyings without static use incorrectly:
333885
Applied Workarounds: count_all_in_varyings_packing
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
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
Chromeos Intel: 634519
Applied Workarounds: decode_encode_srgb_for_generatemipmap
Avoid waiting on a egl fence before pageflipping and rely on implicit
sync.: 721463
Applied Workarounds: rely_on_implicit_sync_for_swap_buffers
Don't expose disjoint_timer_query extensions to WebGL: 808744
Viz service display compositor is not enabled by default.
Disabled Features: viz_display_compositor
Checker-imaging has been disabled via finch trial or the command line.
Disabled Features: checker_imaging

Version Information

Data exported2018-04-20T19:26:51.074Z
Chrome versionChrome/68.0.3401.0
Operating systemLinux 4.4.128-13889-g1733fcca17ec
Software rendering list URLhttps://
chromium.googlesource.com/chromium/src/+/d258c5155b1bb1ca893ee6f86345c341bb6d98f4/gpu/config/software_rendering_list.json
Driver bug list URLhttps://
chromium.googlesource.com/chromium/src/+/d258c5155b1bb1ca893ee6f86345c341bb6d98f4/gpu/config/gpu_driver_bug_list.json
ANGLE commit id025aafdfc4af
2D graphics backendSkia/68 b3a6959408e177bc38b96cb29cfac692f876e100-
Command Line/opt/google/chrome/chrome
--ppapi-flash-path=/opt/google/chrome/pepper/libpepflashplayer.so
--ppapi-flash-version=29.0.0.155 --ui-prioritize-in-gpu-process
--use-gl=egl --enable-native-gpu-memory-buffers --enable-drm-atomic
--enable-hardware-overlays=single-fullscreen,single-on-top
--enable-webgl-image-chromium
--enable-features=Pepper3DImageChromium,PointerEvent,EnableBackgroundBlur,InstantTethering
--gpu-sandbox-failures-fatal=yes --enable-logging --log-level=1 --use-cras
--enable-wayland-server --user-data-dir=/home/chronos
--system-developer-mode --force-clamshell-power-button --login-profile=user
--has-chromeos-keyboard --enable-touchview --enable-voice-interaction
--guest-wallpaper-large=/usr/share/chromeos-assets/wallpaper/guest_large.jpg
--guest-wallpaper-small=/usr/share/chromeos-assets/wallpaper/guest_small.jpg
--child-wallpaper-large=/usr/share/chromeos-assets/wallpaper/child_large.jpg
--child-wallpaper-small=/usr/share/chromeos-assets/wallpaper/child_small.jpg
--default-wallpaper-large=/usr/share/chromeos-assets/wallpaper/oem_large.jpg
--default-wallpaper-small=/usr/share/chromeos-assets/wallpaper/oem_small.jpg
--default-wallpaper-is-oem --arc-availability=officially-supported
--enable-arc-oobe-optin --enterprise-enrollment-initial-modulus=15
--enterprise-enrollment-modulus-limit=19 --login-user=bleung@google.com
--login-profile=828fcb14381e6065d81d5e763947751b648d77da
--flag-switches-begin --flag-switches-end --policy-switches-begin
--isolate-origins=
https://appspot.com/,https://chromium.org/,https://googleapis.com/,https://googleplex.com/,https://googlesource.com/,https://youtube.com/,https://google.com/,https://withgoogle.com/,https://googleacquisitionmigration.com/,https://googleusercontent.com/,https://googleprod.com/,https://nest.com/,https://myworkday.com/,https://chromiumapp.org/,https://lucidchart.com/,https://service-now.com/,https://concursolutions.com/,https://salesforce.com/,https://gcorppartners.com/,https://morganstanley.com/,https://schwab.com/,https://qualtrics.com/,https://ultipro.com/,https://google.secure2-enroll.com/,https://googlegroups.com/,https://google.secure.force.com/,https://ebenefitsnow.com/,https://firebase.com/,https://elo.plusrelocation.com/,https://anthem.com/,https://g.viapeople.net/,https://gdjap.com/,https://asana.com/,https://perquisite.net/,https://postini.com/,https://perkhub.com/,https://gstave.us/,https://geolearning.com/,https://lecorpio.com/,https://inverify.net/,https://preceda.com.au/,https://secureacceptance.cybersource.com/,https://solium.com/,https://fgvms.com/,https://withgoogle.com/,https://ridecell.com/,https://tds.ie/,https://sprinklr.com/,https://smartsheet.com/,https://fieldglass.net/,https://dochub.com/
--policy-switches-end
--vmodule=arc_kiosk*=2,*arc/*=1,automatic_reboot_manager=1,tablet_power_button_controller=1,*chromeos/login/*=1,auto_enrollment_controller=1,*plugin*=2,*zygote*=1,*/ui/ozone/*=1,*/ui/display/manager/chromeos/*=1,*night_light*=1,power_button_observer=2,webui_login_view=2,lock_state_controller=2,webui_screen_locker=2,screen_locker=2
--enable-features=Pepper3DImageChromium,PointerEvent,EnableBackgroundBlur,InstantTethering

Driver Information

Initialization time27
In-process GPUfalse
Passthrough Command Decoderfalse
Direct Compositionfalse
Supports overlaysfalse
Sandboxedtrue
GPU0VENDOR = 0x8086, DEVICE= 0x591e *ACTIVE*
Optimusfalse
AMD switchablefalse
Driver vendorMesa
Driver version18.1.0
Driver date
Pixel shader version3.20
Vertex shader version3.20
Max. MSAA samples16
Machine model name
Machine model version
GL_VENDORIntel Open Source Technology Center
GL_RENDERERMesa DRI Intel(R) HD Graphics 615 (Kaby Lake GT2)
GL_VERSIONOpenGL ES 3.2 Mesa 18.1.0-devel (git-131e871385)
GL_EXTENSIONSGL_ANDROID_extension_pack_es31a
GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5
GL_APPLE_texture_max_level GL_EXT_blend_func_extended GL_EXT_blend_minmax
GL_EXT_buffer_storage GL_EXT_clip_cull_distance GL_EXT_color_buffer_float
GL_EXT_compressed_ETC1_RGB8_sub_texture GL_EXT_copy_image
GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers
GL_EXT_draw_buffers_indexed GL_EXT_draw_elements_base_vertex
GL_EXT_frag_depth GL_EXT_geometry_point_size GL_EXT_geometry_shader
GL_EXT_gpu_shader5 GL_EXT_map_buffer_range GL_EXT_multi_draw_arrays
GL_EXT_occlusion_query_boolean GL_EXT_polygon_offset_clamp
GL_EXT_primitive_bounding_box GL_EXT_read_format_bgra GL_EXT_robustness
GL_EXT_separate_shader_objects GL_EXT_shader_framebuffer_fetch
GL_EXT_shader_integer_mix GL_EXT_shader_io_blocks
GL_EXT_shader_samples_identical GL_EXT_tessellation_point_size
GL_EXT_tessellation_shader GL_EXT_texture_border_clamp
GL_EXT_texture_buffer GL_EXT_texture_compression_dxt1
GL_EXT_texture_cube_map_array GL_EXT_texture_filter_anisotropic
GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_sRGB_decode
GL_EXT_texture_type_2_10_10_10_REV GL_EXT_unpack_subimage
GL_INTEL_conservative_rasterization GL_INTEL_performance_query
GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent
GL_KHR_context_flush_control GL_KHR_debug GL_KHR_no_error
GL_KHR_robust_buffer_access_behavior GL_KHR_robustness
GL_KHR_texture_compression_astc_ldr
GL_KHR_texture_compression_astc_sliced_3d GL_MESA_shader_integer_functions
GL_NV_draw_buffers GL_NV_fbo_color_attachments GL_NV_image_formats
GL_NV_read_buffer GL_NV_read_depth GL_NV_read_depth_stencil
GL_NV_read_stencil GL_OES_EGL_image GL_OES_EGL_image_external
GL_OES_EGL_sync GL_OES_compressed_ETC1_RGB8_texture GL_OES_copy_image
GL_OES_depth24 GL_OES_depth_texture GL_OES_depth_texture_cube_map
GL_OES_draw_buffers_indexed GL_OES_draw_elements_base_vertex
GL_OES_element_index_uint GL_OES_fbo_render_mipmap
GL_OES_geometry_point_size GL_OES_geometry_shader GL_OES_get_program_binary
GL_OES_gpu_shader5 GL_OES_mapbuffer GL_OES_packed_depth_stencil
GL_OES_primitive_bounding_box GL_OES_required_internalformat
GL_OES_rgb8_rgba8 GL_OES_sample_shading GL_OES_sample_variables
GL_OES_shader_image_atomic GL_OES_shader_io_blocks
GL_OES_shader_multisample_interpolation GL_OES_standard_derivatives
GL_OES_stencil8 GL_OES_surfaceless_context GL_OES_tessellation_point_size
GL_OES_tessellation_shader GL_OES_texture_3D GL_OES_texture_border_clamp
GL_OES_texture_buffer GL_OES_texture_cube_map_array 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_texture_stencil8 GL_OES_texture_storage_multisample_2d_array
GL_OES_vertex_array_object GL_OES_vertex_half_float GL_OES_viewport_array
Disabled ExtensionsGL_KHR_blend_equation_advanced
GL_KHR_blend_equation_advanced_coherent
Disabled WebGL ExtensionsEXT_disjoint_timer_query
EXT_disjoint_timer_query_webgl2
Window system binding vendorMesa Project
Window system binding version1.4 (DRI2)
Window system binding extensionsEGL_ANDROID_native_fence_sync
EGL_EXT_create_context_robustness EGL_EXT_image_dma_buf_import
EGL_EXT_image_dma_buf_import_modifiers EGL_KHR_config_attribs
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_EXT_pixel_format_float EGL_KHR_wait_sync
EGL_MESA_configless_context EGL_MESA_drm_image EGL_MESA_image_dma_buf_export
Direct renderingYes
Reset notification strategy0x8252
GPU process crash count0

Compositor Information

Tile Update ModeOne-copy
Partial RasterEnabled

GpuMemoryBuffers Status

ATCSoftware only
ATCIASoftware only
DXT1Software only
DXT5Software only
ETC1Software only
R_8SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE,
GPU_READ_CPU_READ_WRITE_PERSISTENT
R_16Software only
RG_88SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE,
GPU_READ_CPU_READ_WRITE_PERSISTENT
BGR_565GPU_READ
RGBA_4444Software only
RGBX_8888GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE
RGBA_8888GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE
BGRX_8888GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE
BGRX_1010102Software only
RGBX_1010102Software only
BGRA_8888GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE,
GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
RGBA_F16Software only
YVU_420GPU_READ
YUV_420_BIPLANARSCANOUT_CAMERA_READ_WRITE, SCANOUT_CPU_READ_WRITE,
GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
UYVY_422Software only

Display(s) Information

InfoDisplay[21692109949126656] bounds=[0,0 1200x800], workarea=[0,0
1200x752], scale=2, internal.
Color space information{primaries_d50_referred: [[0.6483, 0.3302], [0.3206,
0.5982], [0.1552, 0.0656]], transfer:0.0000*x + 0.0000 if x < 0.0000 else
(1.0000*x + 0.0000)**2.2000 + 0.0000, matrix:RGB, range:FULL}
Bits per color component8
Bits per pixel24

Video Acceleration Information

Decode h264 baselineup to 4096x4096 pixels
Decode h264 mainup to 4096x4096 pixels
Decode h264 highup to 4096x4096 pixels
Decode vp8up to 4096x4096 pixels
Decode vp9 profile0up to 4096x4096 pixels
Decode vp9 profile2up to 4096x4096 pixels
Encode h264 baselineup to 4096x4096 pixels and/or 30.000 fps
Encode h264 mainup to 4096x4096 pixels and/or 30.000 fps
Encode h264 highup to 4096x4096 pixels and/or 30.000 fps
Encode vp9 profile0up to 4096x4096 pixels and/or 30.000 fps

Log Messages

[6240:6247:0420/122641.822309:VERBOSE1:drm_device_manager.cc(53)] : Could
not initialize DRM device for /sys/devices/platform/vgem/drm/card1
[6240:6247:0420/122642.831049:VERBOSE1:drm_display.cc(104)] : DRM
configuring: device=/sys/devices/pci0000:00/0000:00:02.0/drm/card0 crtc=35
connector=57 origin=0,0 size=2400x1600