kworker/0:1+kacpid shows 83% CPU usage.

[Condobloke]

Kernel updates today for 5.4 & 5.13
Installed them both and rebooted.

All good.

I found a bios update....

1.20

2015/9/3

9.33MB

Instant Flash

Improve system stability.​

Global

China

from https://asrock.com/MB/Intel/B150M Pro4/index.asp#BIOS

It's description?.....Improve system stability.