If MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0 doesn't work for you (after rebooting) then you are commenting on the wrong bug.
Edit: popov895 has moved to bug 1977977.
If MUTTER_ DEBUG_ENABLE_ ATOMIC_ KMS=0 doesn't work for you (after rebooting) then you are commenting on the wrong bug.
Edit: popov895 has moved to bug 1977977.