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.
I'm also seeing this problem exactly as per bug description.
Apr 17 14:26:01 n1687 gnome-shell[ 845778] : Page flip discarded: drmModeAtomicCo mmit: Invalid argument 845778] : Failed to post KMS update: drmModeAtomicCo mmit: Invalid argument 845778] : Page flip discarded: drmModeAtomicCo mmit: Invalid argument
Apr 17 14:26:01 n1687 gnome-shell[
Apr 17 14:26:01 n1687 gnome-shell[
Using laptop with external monitor in single display mode, Intel graphics.