Sorry - not a total noob here, but enough to embarrass myself... I had to boot with "nomodeset" in order to get my machine to boot. That caused the situation I described here. When I blacklisted the nouveau video driver, I got my functionality back.
For those who know better how to fix these things - the real problem is that the nouveau driver didn't work on my XPS 13 9365, causing it to hang while trying to boot. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1873700 Title: Display won't rotate, rotate lock/unlock button missing, can't rotate screen with xrandr commands Status in gnome-shell package in Ubuntu: New Bug description: I lost ability to rotate the display upon upgrade to 20.04. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: gnome-shell 3.36.1-5ubuntu1 ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30 Uname: Linux 5.4.0-24-generic x86_64 ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Sun Apr 19 15:04:26 2020 DisplayManager: gdm3 RelatedPackageVersions: mutter-common 3.36.1-3ubuntu3 SourcePackage: gnome-shell UpgradeStatus: Upgraded to focal on 2020-04-18 (1 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1873700/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp