Comment 1 for bug 1826691

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