*** This bug is a duplicate of bug 1968040 ***
    https://bugs.launchpad.net/bugs/1968040

Thanks for the bug report. I think we should group this with bug 1968040
which also mentions a workaround:

  Add to /etc/environment:
    MUTTER_DEBUG_FORCE_KMS_MODE=simple
  and then reboot.

Please also test without a dock so we know if that's a major factor.

** This bug has been marked a duplicate of bug 1968040
   [i915] Blanked screen doesn't wake up after locking [drmModeAtomicCommit: 
Argument invalide] [drmModeAtomicCommit: Invalid argument]

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https://bugs.launchpad.net/bugs/2167728

Title:
  External monitor on USB-C dock stays black after unlock; mutter atomic
  KMS commit fails with Invalid argument

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