It's not clear to me which change in 1.20.10 that upstream think solved this. The release notes are here: https://lists.x.org/archives/xorg- announce/2020-December/003067.html
Maybe this fix? https://gitlab.freedesktop.org/xorg/xserver/-/commit/c3e4c1a0fd5d4d6015e9e6317b758018317e56d1 -- 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/1896627 Title: Windows flicker when being resized with the mouse (Xorg sessions) Status in GNOME Shell: Unknown Status in Mutter: Unknown Status in mutter package in Ubuntu: Triaged Status in xorg-server package in Ubuntu: Triaged Bug description: When resizing a window with the mouse by dragging the edge or corner, the window begins to flicker. It only flickers when actively being resized, and when I stop dragging, it looks normal. This behavior is does not occur on same pc in 20.04. ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4 Uname: Linux 5.8.0-18-generic x86_64 ApportVersion: 2.20.11-0ubuntu45 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: skip CompositorRunning: None CurrentDesktop: Budgie:GNOME CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted Date: Tue Sep 22 10:21:51 2020 DistUpgraded: Fresh install DistroCodename: groovy DistroVariant: ubuntu ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Lenovo Skylake GT2 [HD Graphics 520] [17aa:2231] InstallationDate: Installed on 2020-09-22 (0 days ago) InstallationMedia: Ubuntu-Budgie 20.10 "Groovy Gorilla" - Alpha amd64 (20200921) MachineType: LENOVO 20FJS0AJ00 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-18-generic root=UUID=72bd1806-98fb-4fa6-be5b-638dec36ebc9 ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/07/2016 dmi.bios.release: 1.13 dmi.bios.vendor: LENOVO dmi.bios.version: N1KET26W (1.13 ) dmi.board.asset.tag: Not Available dmi.board.name: 20FJS0AJ00 dmi.board.vendor: LENOVO dmi.board.version: SDK0J40697 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.ec.firmware.release: 1.5 dmi.modalias: dmi:bvnLENOVO:bvrN1KET26W(1.13):bd10/07/2016:br1.13:efr1.5:svnLENOVO:pn20FJS0AJ00:pvrThinkPadT560:rvnLENOVO:rn20FJS0AJ00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad T560 dmi.product.name: 20FJS0AJ00 dmi.product.sku: LENOVO_MT_20FJ_BU_Think_FM_ThinkPad T560 dmi.product.version: ThinkPad T560 dmi.sys.vendor: LENOVO version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.102-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 20.1.7-1 version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu6 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/gnome-shell/+bug/1896627/+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
