Someone please help us to find the cause of this bug by:

1. Remove all workarounds.
2. Add kernel parameter: drm.debug=0xff
3. Add to /etc/environment: MUTTER_DEBUG=kms
4. Reboot.
5. Reproduce the bug.
6. Run: journalctl -b0 > journal.txt
7. Attach the resulting text file here.

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https://bugs.launchpad.net/bugs/1968040

Title:
  Blanked screen doesn't wake up after locking [drmModeAtomicCommit:
  Argument invalide] [drmModeAtomicCommit: Invalid argument]

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