Raspberry Pi 4/400 running Ubuntu 21.10 freezes when dragging app icon to dock

I’ve upgraded a Raspberry Pi 400 from Ubuntu 21.04 to 21.10, however as firefox was removed from the dock, whenever I go to launchpad then drag the firefox icon back to the dock, as soon as the drag action commences the system becomes unresponsive. REISUB/REISUP sometimes works after significant delays. I’ve seen reports also of the same issue on Raspberry Pi 4 models. Reports also say they can ssh into the machine fine.




Cause may be


Yes, graphics freezes on Raspberry Pi in 21.10 should be discussed in bug 1946368 for now.