Failed to post KMS update: CRTC property (GAMMA_LUT) not found ; Page flip discarded: CRTC property (GAMMA_LUT) not found

It appears meta_kms_crtc_has_gamma is returning a false positive on mgag200 in mutter 42.2:

[ 7123.822417] ubuntu1 gnome-shell[2773]: Failed to post KMS update: CRTC property (GAMMA_LUT) not found
[ 7123.823384] ubuntu1 gnome-shell[2773]: Page flip discarded: CRTC property (GAMMA_LUT) not found

https://launchpad.net/bugs/1985869
https://launchpad.net/bugs/1991777