Also to clarify:

The first dmesg I uploaded had
`rcu: INFO: rcu_sched detected stalls on CPUs/tasks:` in the log. Adding
`idle=nomwait` to kernel cmdline has so far fully resolved this and other
messages which sometimes would appear which not always referenced rcu_sched but
seemed to imply a cpu or thread had stalled. There seem to be several Ryzen
errata related to mwait
(https://www.amd.com/system/files/TechDocs/55449_Fam_17h_M_00h-0Fh_Rev_Guide.pdf)
so I think that issue is fixed though the amdgpu/drm issues seem to have
remained.