Created attachment 145992 [details]
cat /sys/class/drm/card0/error > sys-class-drm-card0-error
It is probably the same/similar to one of the other 4 with such a error message:
but it is not obvious which one should be - all of them have some follow-ups and non-trivial responses.
[177570.522360] i915 0000:00:02.0: GPU HANG: ecode 9:0:0x00000000, hang on rcs0
[177570.522364] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[177570.522365] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[177570.522366] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[177570.522367] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[177570.522368] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[177570.523407] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
It happened almost 4 days ago - but evidently recovered, as I did not notice until I look at dmesg - the system is still up and functional after 4 days after that event.
I am filing here, mostly because the message said I should. Please feel free to resolve the duplicate of one of the others, etc.
According to Ubuntu's apt, the version is:
xserver-xorg-video-intel/disco,now 2:2.99.917+git20180925-2 amd64 [installed,automatic]
X.Org X server -- Intel i8xx, i9xx display driver
linux-firmware/disco-updates,disco-updates,disco-security,disco-security,now 1.178.6 all [installed,automatic]
Firmware for Linux kernel drivers
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 630 (Desktop) (prog-if 00 [VGA controller])
Subsystem: ASUSTeK Computer Inc. UHD Graphics 630 (Desktop)
Flags: bus master, fast devsel, latency 0, IRQ 128
Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
Memory at 90000000 (64-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities:  Vendor Specific Information: Len=0c <?>
Capabilities:  Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities:  Process Address Space ID (PASID)
Capabilities:  Address Translation Service (ATS)
Capabilities:  Page Request Interface (PRI)
Kernel driver in use: i915
Kernel modules: i915
$ uname -r
*** This bug has been marked as a duplicate of bug 111970 ***