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
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/ 57816a7907e5f56 c2136af31a4f1ae 5186d87565
For now you can do the following: daemon. conf
1. Blacklist synapticsmst plugin in fwupd in /etc/fwupd/
Or
2. Try a newer kernel (like 5.x)
Or
3. Backport that patch from fwupd