Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: drm i915
** Attachment added: "i915 Hang Kernel Error Dump"
https://bugs.launchpad.net/bugs/1744935/+attachment/5041734/+files/drm-card1-error.dump
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https://bugs.launchpad.net/bugs/1744935
Title:
[i915] Display Corruption
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