With all latest updates I got this:

Broadcast message from systemd-journald@quark (Wed 2020-10-14 12:57:36 MST):
systemd[1]: Caught <SEGV>, dumped core as pid 28687.

Broadcast message from systemd-journald@quark (Wed 2020-10-14 12:57:36 MST):
systemd[1]: Freezing execution.

When trying to shutdown I got this:

0 quark:/home/reg # init 6
Segmentation fault (core dumped)
0 quark:/home/reg # init 0
Segmentation fault (core dumped)
0 quark:/home/reg # 

I had to power off.

KDE disappeared so that all my screens were just black although my apps were
still there.

My boot loader looks like this:
splash=silent resume=/dev/disk/by-uuid/6f7781f5-5caf-4dd9-aa59-00f9ec46136c
quiet pci=noaer acpi_enforce_resources=lax amdgpu.si_support=1
radeon.si_support=0 

Not that just a few days ago I moved over to amdgpu from radeon which has
solved a lot of problems.