Thanks Ian. EACCES is something we could synthesise and test against. I
can see some of the native backend code retries on EBUSY, but never
EACCES. Though it's not something you would want to retry at full frame
rate.

Can anyone else test the theory? The steps are:

1. Add MUTTER_DEBUG=kms to /etc/environment

2. Reboot.

3. Log in to a Wayland session.

4. Repeat step 3 until the bug happens again.

5. Recover and run:

   journalctl -b0 > journal.txt
   journalctl -b-1 > prevjournal.txt

6. Attach the resulting text files here.

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https://bugs.launchpad.net/bugs/2089709

Title:
  Ubuntu 24.04 sometimes logs in to a black screen if the mouse is moved
  during login

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