Comment 31 for bug 1968040

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Daniel van Vugt (vanvugt) wrote : Re: Blanked screen doesn't wake up after locking [drmModeAtomicCommit: Argument invalide] [drmModeAtomicCommit: Invalid argument]

Just add MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0 to /etc/environment and then reboot. If that doesn't fix your problem then please open a new bug.