** Description changed:

- I reported that against mutter, but it can be gnome-shell as well. Or
- Intel driver/Kernel related. It happens since I switched to Impish,
- never saw that before.
+ 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.
  
- Intel HD graphics 400 onboard.
+ 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.
  
- STEPS to reproduce: 
- 1) Move Mouse pointer to the left edge of the screen
- 2) See that everything works as expected
- 3) Start 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 1: At first I thought that it was related to dash-to dock
- since moving the mouse to the area where I used to have the dock
- exhibits the flicker (I had 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: I doesn't happen without any window onscreen. Having a
+ 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 it shows. Fun Fact 1: "Files" exhibits
- it more "aggresive" than "Terminal".
+ 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. When recording the screencast the issue
- doesn't happen.
+ "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 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)

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https://bugs.launchpad.net/bugs/1943083

Title:
  screen flashes black (mouse pointer stays visible) when moving mouse
  pointer to the left edge of the screen

Status in mutter package in Ubuntu:
  New

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)

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