Comment 9 for bug 1967274

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Daniel van Vugt (vanvugt) wrote : Re: Screen can't turn on after screen off [Failed to post KMS update: CRTC property (GAMMA_LUT) not found]

Please try these in /etc/environment:

  MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0
  MUTTER_DEBUG_DISABLE_TRIPLE_BUFFERING=1

and then reboot.

If that works then please figure out which one is actually fixing the problem.