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Black screen when un-minimising

I've just set up a new Linux PC running Debian Bullseye (11). Previous PC (Debian 10) had no problems.

After using Joplin, I minimise it. When restoring from being minimised, the window has a menu bar but the body is entirely black. Moving the mouse across the window I do see the cursor change shape as it moves over different elements of the window.

If I minimise and immediately restore Joplin, the problem does not occur. I'm not sure how long I have to leave it minimised for to trigger this - maybe 10 minutes or so. I have tried with a debug window but that too is entirely black. Closing and re-opening Joplin fixes the the problem. No other apps behave like this.

Any suggestions?

  • The version you are using: 1.8.5
  • The operating system you are using: Debian 11


Update: problem occurs when screen lock (light-locker) is unlocked.

Reported on github as issue #5062