Thanks. Unfortunately MUTTER_DEBUG=kms can't tell us which is the
invalid argument and I can't see a consistent pattern in the log.

Please try these in /etc/environment in separate sessions:

  MUTTER_DEBUG_DISABLE_TRIPLE_BUFFERING=1

  MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0

** Changed in: mutter (Ubuntu)
       Status: New => Incomplete

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

Title:
  Blanked screen doesn't wake up after locking

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