Intel GPU lockups and graphical glitches in KDE

[Lastique]

After a recent package update (at this point, I believe it was a kernel package upgrade) I began experiencing Intel GPU hangs and graphical glitches, such as blinking or corrupt textures in the panels and windows. In dmesg I can see messages like these:

[ 24.825956] i915 0000:00:02.0: [drm] GPU HANG: ecode 7:1:86d2bff9, in plasmashell [1625]
[ 24.826005] i915 0000:00:02.0: [drm] Resetting chip for stopped heartbeat on rcs0
[ 24.927993] i915 0000:00:02.0: [drm] plasmashell[1625] context reset due to GPU hang

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: linux-image-5.8.0-50-lowlatency 5.8.0-50.56
ProcVersionSignature: Ubuntu 5.8.0-50.56-lowlatency 5.8.18
Uname: Linux 5.8.0-50-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu50.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: lastique 1319 F.... pulseaudio
 /dev/snd/controlC1: lastique 1319 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Mon Apr 19 02:18:39 2021
HibernationDevice:
 # Prevents "gave up waiting for suspend/resume device" timeout on boot
 RESUME=none
InstallationDate: Installed on 2013-10-11 (2746 days ago)
InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: ASUSTeK COMPUTER INC. N550JV
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-50-lowlatency root=UUID=bafa6509-dea3-48a1-a308-129b1514ab28 ro quiet splash nmi_watchdog=0
RelatedPackageVersions:
 linux-restricted-modules-5.8.0-50-lowlatency N/A
 linux-backports-modules-5.8.0-50-lowlatency N/A
 linux-firmware 1.190.3
SourcePackage: linux
UpgradeStatus: Upgraded to groovy on 2020-11-21 (148 days ago)
WifiSyslog:

dmi.bios.date: 11/19/2013
dmi.bios.release: 4.6
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: N550JV.208
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: N550JV
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN550JV.208:bd11/19/2013:br4.6:svnASUSTeKCOMPUTERINC.:pnN550JV:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN550JV:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: N
dmi.product.name: N550JV
dmi.product.sku: ASUS-NotebookSKU
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1924624, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

[Lastique (andysem)]

It seems, it started happening with kernel version 5.8.0-49. With 5.8.0-48 I can't reproduce this behavior, at least not as easily.