The specific part of the screen shot with obvious corruption is cropped below. I'll try to get a video; one problem I have is that many of the specific things I do that reliably show the problem are at times when private data is visible on my screen.
I _cannot_ show this problem without the XrandR command (or some GUI- configured equivalent), because it seems to only happen with external DisplayPort monitors attached. When I use _only_ the internal laptop panel things appear to work correctly (or did last time I checked, I very seldom run only one display). I believe the problem is triggered by either 1) daisy-chained DisplayPort monitors or 2) the sheer size of my desktop (11520x2160). I will try to find something that reliably corrupts that is not sensitive to get a video, and I will test with no external displays attached and verify that that is still error-free. ** Attachment added: "corruption.png" https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1893969/+attachment/5412195/+files/corruption.png -- 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/1893969 Title: Screen corruption and delayed update using onboard Intel video Status in mutter package in Ubuntu: Incomplete Status in xorg-server package in Ubuntu: Incomplete Bug description: I frequently get screen corruption or delayed screen updates using onboard Intel video (i7-10710U in a Dell XPS 13 7390). I am attaching a screen shot of an example of this in Emacs, where you can see echoes of past cursor locations (center right side of screen, the highlighted word "boolean"). A frequent failure is that an application updates its window, but the updates do not appear on screen until I take some action to disturb the window (move or resize it, change focus, change desktops, etc.), after which it cleans itself up. Small changes (such as selecting text) will often clean up the image where the change is made without repainting the entire window. My display panel is 4K UHD+, and I have attached two external Full HD DisplayPort monitors using chaining with 2x2 scale using XrandR. This corruption appears to happen on all three surfaces. The configuration for my desktop is: HIX=3840 HIY=2160 HI=${HIX}x${HIY} xrandr --fb $(($HIX * 3))x$HIY \ --output eDP-1 --auto --panning ${HI}+$(($HIX * 2))+0 \ --output DP-2-8 --auto --panning ${HI}+$HIX+0 \ --scale-from $HI --left-of eDP-1 --scale 2x2 \ --output DP-2-1 --auto --panning $HI+0+0 \ --scale-from $HI --left-of DP-2-8 --scale 2x2 ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44 Uname: Linux 5.4.0-42-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.8 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: skip CompositorRunning: None CurrentDesktop: Date: Wed Sep 2 11:48:03 2020 DistUpgraded: 2020-06-21 15:36:52,619 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py' DistroCodename: focal DistroVariant: ubuntu DkmsStatus: v4l2loopback, 0.12.3, 5.4.0-42-generic, x86_64: installed DpkgLog: ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation Device [8086:9bca] (rev 04) (prog-if 00 [VGA controller]) Subsystem: Dell Device [1028:0962] MachineType: Dell Inc. XPS 13 7390 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-42-generic root=UUID=aeb9197c-491f-493d-9a7a-7094efd5023c ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: Upgraded to focal on 2020-06-21 (72 days ago) dmi.bios.date: 11/25/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.4.0 dmi.board.name: 0377MH dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.4.0:bd11/25/2019:svnDellInc.:pnXPS137390:pvr:rvnDellInc.:rn0377MH:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: XPS dmi.product.name: XPS 13 7390 dmi.product.sku: 0962 dmi.sys.vendor: Dell Inc. version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.101-2 version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1 version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1 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/mutter/+bug/1893969/+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
