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.
** Changed in: gnome-shell (Ubuntu)
Status: Confirmed => Incomplete
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1967274
Title:
Screen can't turn on after screen off [Failed to post KMS update: CRTC
property (GAMMA_LUT) not found]
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