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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1744935
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1744935
Title:
[i915] Display Corruption
Status in linux package in Ubuntu:
Incomplete
Bug description:
Sometime during a regular package update of Ubuntu of 17.10 I started
having screen corruption issues within GL apps (e.g. WebGL on google
maps) on both the external screens as well as the laptops (Thinkpad
T460p), but then spread further to the regular desktop. I updated to
Ubuntu 18.04 to try to resolve the issue and then even updated the
kernel to the Linux-4.15-rc8 (4.15.0-994-generic) but the issues
remain on both Wayland and Xorg. It seems related to the 3D
acceleration since the corruption only starts with gdm, not on the
framebuffer before. The issue happens on every boot. The i915 module
is loaded with its default parameters, the nvidia card is deactivated
with switcheroo and the proprietary driver has never been installed.
The corruption is best described as flashing distortions associated
with timers and/or input events. Sometimes a whole triangular section
of up to a quarter of the double-screen setup is streched and/or
discolored or blacked out. Sometimes black squares (a few pixels)
splatter the whole screen for a few frames until a damaged region is
updated. It looks like some kind of shader issue.
Sometimes the screen gets stuck for a few seconds (presumably the hang
from the crashdump attached), so it's possible that there are multiple
issues but I can't discern them.
dmesg reports:
`
[31026.161705] [drm] Reducing the compressed framebuffer size. This may lead
to less power savings than a non-reduced-size. Try to increase stolen memory
size if available in BIOS.
[31731.589497] [drm] Reducing the compressed framebuffer size. This may lead
to less power savings than a non-reduced-size. Try to increase stolen memory
size if available in BIOS.
[32477.060892] [drm] Reducing the compressed framebuffer size. This may lead
to less power savings than a non-reduced-size. Try to increase stolen memory
size if available in BIOS.
[35533.800723] [drm] GPU HANG: ecode 9:0:0x85dffffb, in gnome-shell [14269],
reason: Hang on rcs0, action: reset
[35533.800725] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[35533.800725] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[35533.800725] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[35533.800726] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[35533.800726] [drm] GPU crash dump saved to /sys/class/drm/card1/error
[35533.800768] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[36101.847545] [drm] Reducing the compressed framebuffer size. This may lead
to less power savings than a non-reduced-size. Try to increase stolen memory
size if available in BIOS.
[41209.093879] [drm] Reducing the compressed framebuffer size. This may lead
to less power savings than a non-reduced-size. Try to increase stolen memory
size if available in BIOS.
[43073.711135] [drm] Reducing the compressed framebuffer size. This may lead
to less power savings than a non-reduced-size. Try to increase stolen memory
size if available in BIOS.
[43339.548927] [drm] Reducing the compressed framebuffer size. This may lead
to less power savings than a non-reduced-size. Try to increase stolen memory
size if available in BIOS.
[43886.208705] [drm] Reducing the compressed framebuffer size. This may lead
to less power savings than a non-reduced-size. Try to increase stolen memory
size if available in BIOS.
[44617.864814] [drm] Reducing the compressed framebuffer size. This may lead
to less power savings than a non-reduced-size. Try to increase stolen memory
size if available in BIOS.
[45925.860575] i915 0000:00:02.0: Resetting rcs0 after gpu hang
`
The memory size in UEFI is already set to the maximum of 512Mb.
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