After installation it just hangs with a cursor at the top left of the screen

[Neal Cloud]

System boots OK from USB install and shows the screen in 4k on my iiyama monitor.

But after installation it just hangs with a cursor at the top left of the screen.
So after editing grub with "nomodeset" it then boots with this error (no UMS support in Radeon module) then boots into the desktop at a fixed 1024x768..

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gnome-shell 42.0-1ubuntu1
ProcVersionSignature: User Name 5.15.0-23.23-generic 5.15.27
Uname: Linux 5.15.0-23-generic x86_64
ApportVersion: 2.20.11-0ubuntu80
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 9 16:27:40 2022
DisplayManager: gdm3
InstallationDate: Installed on 2022-03-30 (10 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220326)
RelatedPackageVersions: mutter-common 42.0-1ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

It sounds like "nomodeset" is actually causing the newest error:

  no UMS support in Radeon module

That's expected with nomodeset and probably not a bug. So we should instead find out why you had a hang with only a cursor at the top left of the screen.

Please:

 1. Remove "nomodeset".

 2. Reboot (expecting it to fail).

 3. Reboot again with "nomodeset" and run:

    journalctl -b-1 > prevboot.txt

 4. Attach the resulting text file here.

[Launchpad Janitor (janitor)]

[Expired for Ubuntu because there has been no activity for 60 days.]