I have the same problem on that kernel (ubuntu 20.10), and on the update to 5.8.0-50.55. I have gone back to 5.8.0-48.54 and it has stabilised. I get all sorts of different effects. Blocks of text being partially blank, whole menu boxes being blank, and so on. This usually happened after the system has been on for a few hours, so I initially suspected hardware, but reverting to 5.8.0-48 fixed it.
The worst effected are browsers (Firefox, Chrome and Brave) possibly only when not full screen, but parts of the application icon toolbar and others parts flicker on and off as well. I tried wayland, but it was no better, so an x.org update may not help (I can't see one available at present) I'm using "Intel® HD Graphics 4600 (HSW GT2) graphics", on "Intel® Core™ i7-4770T CPU @ 2.50GHz × 8". No special drivers. Monitor connected via HDMI. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1923632 Title: Screen flickering Status in xorg-server package in Ubuntu: Incomplete Bug description: ubuntu whole screen flickering. ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: xorg 1:7.7+19ubuntu15 ProcVersionSignature: Ubuntu 5.8.0-49.55-generic 5.8.18 Uname: Linux 5.8.0-49-generic x86_64 ApportVersion: 2.20.11-0ubuntu50.5 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: skip CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Tue Apr 13 20:36:04 2021 DistUpgraded: Fresh install DistroCodename: groovy DistroVariant: ubuntu GraphicsCard: Intel Corporation 4th Generation Core Processor Family Integrated Graphics Controller [8086:041e] (rev 06) (prog-if 00 [VGA controller]) Subsystem: Micro-Star International Co., Ltd. [MSI] 4th Generation Core Processor Family Integrated Graphics Controller [1462:7817] InstallationDate: Installed on 2021-04-13 (0 days ago) InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022) MachineType: MSI MS-7817 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-49-generic root=UUID=03a76041-a4c2-4e9f-a936-29041654a888 ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/21/2015 dmi.bios.release: 4.6 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: V6.7 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: H81M-E33 (MS-7817) dmi.board.vendor: MSI dmi.board.version: 1.0 dmi.chassis.asset.tag: To be filled by O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: MSI dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV6.7:bd04/21/2015:br4.6:svnMSI:pnMS-7817:pvr1.0:rvnMSI:rnH81M-E33(MS-7817):rvr1.0:cvnMSI:ct3:cvr1.0: dmi.product.family: To be filled by O.E.M. dmi.product.name: MS-7817 dmi.product.sku: To be filled by O.E.M. dmi.product.version: 1.0 dmi.sys.vendor: MSI version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.102-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.10.1 version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200714-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1923632/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
