After not doing so for a few months, I recently dist-upgraded my Debian testing system. Since then when I move my mouse cursor a transparent rectangle with black borders is shown around the cursor. The rectangles also remain on the screen with a delay effect until something is changed (mouse click, arrow keys, etc.).
For creating the screenshot I moved the mouse cursor in a spiral and then took a photo. The effect wouldn't show in
gnome-screenshot (either it would disappear or the entire screenshot would be black except for the last rectangle).
- Debian testing with GNOME.
- Same effect under Wayland or Xorg, even in GNOME Classic.
- Version information (
uname -a): Linux paninaro 5.8.0-1-amd64 #1 SMP Debian 5.8.7-1 (2020-09-05) x86_64 GNU/Linux.
I used the same machine and setup successfully for years and just ran
apt-get dist-upgrade (and also updated the firmware) last week for the first time in a couple of months.
Any insights as to what might cause the problem and how it can be fixed would be much appreciated.