That happens to me also on Ubuntu Gnome 17.04. It's not random though but rather when the screen shuts off after I leave the computer inactive. When I turn the screen back on, it's 90 degrees clockwise (and quite puzzling to get the mouse working to be able to reboot because of muscle memory).
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1682978 Title: Random Screen Rotation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1682978/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp