This is a bug in the amdgpu kernel module. When trying to access the DP aux channel it is causing system hangs.
At least in upstream fwupd there is a recently committed workaround: https://github.com/hughsie/fwupd/commit/57816a7907e5f56c2136af31a4f1ae5186d87565 For now you can do the following: 1. Blacklist synapticsmst plugin in fwupd in /etc/fwupd/daemon.conf Or 2. Try a newer kernel (like 5.x) Or 3. Backport that patch from fwupd ** Also affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1826691 Title: fwupd hangs after 19.04 upgrade from 18.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fwupd/+bug/1826691/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
