This reminds me of bug 1935901 and bug 1767654 but isn't quite the same... Next time the problem happens please run:
journalctl -b0 > journal.txt and attach the resulting text file here. Also it might be helpful to see if you can find kernel versions older than 5.13 that don't have the bug: https://kernel.ubuntu.com/~kernel- ppa/mainline/?C=M;O=D ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1943083 Title: [i915] [Braswell] screen flashes black (mouse pointer stays visible) when moving mouse pointer to the left edge of the screen Status in linux package in Ubuntu: Incomplete Bug description: I reported that against mutter, but it can be gnome-shell as well, or even Intel driver/kernel related. It happens since my switch to Impish, I have never seen that issue before. Integrated Intel HD graphics 400 onboard. STEPS to reproduce: 1) Move the mouse pointer to the left edge of the screen 2) See that everything works as expected 3) Open an app so that the window comes up, eg. "Files" 4) Move the mouse pointer to the left edge again. 5) See that the screen goes black for a second, but the mouse pointer stays visible. Observation 1: At first I thought that it was related to dash-to-dock because moving the mouse to the area where I used to have the dock exhibits the flicker (I moved it to bottom for GNOME 40). But it turns out that it doesn't matter: I can turn off the extension completely or move it back to the left and the flicker always occurs. Observation 2: It doesn't happen without any window onscreen. Having a program minimized to the dock doesn't suffice to exhibit the bug. I have to bring up the window and then the bug shows up. Fun Fact 1: "Files" exhibits it more "aggresively" than "Terminal". It is easier to trigger. With gnome-terminal I sometimes can hit the edge with the pointer without triggering the glitch. Observation 3: I cannot record the issue: Recording a screencast via "Ctrl-Alt-Shift-R" doesn't work. Well, the screencasting itself does work, but when recording the screencast the glitch simply doesn't happen. I am a bit lost further debugging this, any help is highly welcome. I guess that my observations rather hint at mutter being to blame. ProblemType: Bug DistroRelease: Ubuntu 21.10 Package: mutter 40.2.1-1ubuntu1 ProcVersionSignature: Ubuntu 5.13.0-14.14-generic 5.13.1 Uname: Linux 5.13.0-14-generic x86_64 ApportVersion: 2.20.11-0ubuntu68 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Wed Sep 8 23:03:53 2021 InstallationDate: Installed on 2018-02-23 (1293 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180214) SourcePackage: mutter UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1943083/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
