One more thing, which also worked ok before: after coming back from resume, there is out-of-sync noise on the external monitor. Switching to vt1 and back fixes it, which suggests to me it's also mode-setting related.
One more thing, which also worked ok before: after coming back from resume, there is out-of-sync noise on the external monitor. Switching to vt1 and back fixes it, which suggests to me it's also mode-setting related.