I'm also seeing this problem exactly as per bug description.
Apr 17 14:26:01 n1687 gnome-shell[845778]: Page flip discarded:
drmModeAtomicCommit: Invalid argument
Apr 17 14:26:01 n1687 gnome-shell[845778]: Failed to post KMS update:
drmModeAtomicCommit: Invalid argument
Apr 17 14:26:01 n1687 gnome-shell[845778]: Page flip discarded:
drmModeAtomicCommit: Invalid argument
Using laptop with external monitor in single display mode, Intel
graphics.
** Changed in: mutter (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1968040
Title:
Blanked screen doesn't wake up after locking [drmModeAtomicCommit:
Argument invalide]
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