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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)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug impish wayland-session
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screen flashes black (mouse pointer stays visible) when moving mouse pointer to
the left edge of the screen
https://bugs.launchpad.net/bugs/1943083
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