During the upgrade, ubuntu may have switched my driver from amdgpu to radeon. Following these instructions reactivate the amdgpu driver, and all seems to be well.
https://askubuntu.com/a/1236011/14747 ** Changed in: xserver-xorg-video-ati (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/2068342 Title: screen turns to snow with radeon driver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/2068342/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp

