System crashing, related to PowerDevil?

System has been fine for ages, but today it has suddenly crashed twice.

It looks to me like the crash is related to org_kde_powerdevil since that had an error at the exact moment the system crashed both times:

$ last -x | head | tac
rob      tty1                          Sat Nov  1 13:48 - down   (13:19)
shutdown system down  6.17.6-arch1-1   Sun Nov  2 03:07 - 14:00  (10:53)
reboot   system boot  6.17.6-arch1-1   Sun Nov  2 14:00   still running
rob      tty1                          Sun Nov  2 14:01 - crash  (03:12)
reboot   system boot  6.17.6-arch1-1   Sun Nov  2 17:13   still running
rob      tty1                          Sun Nov  2 17:18 - crash  (00:21)
rob      pts/0        :1               Sun Nov  2 17:19 - 17:21  (00:02)
reboot   system boot  6.17.6-arch1-1   Sun Nov  2 17:40   still running
rob      tty1                          Sun Nov  2 17:40   still logged in
rob      pts/0        :1               Sun Nov  2 17:42   still logged in
$ journalctl -b -1 -p 3
Nov 02 17:13:06 rob-linux kernel: hub 8-0:1.0: config failed, hub doesn't have any ports! (err -19)
Nov 02 17:13:07 rob-linux kernel: 
Nov 02 17:18:53 rob-linux org_kde_powerdevil[1667]: [  1667] busno=5, All features that should not exist detected. Monitor does not indicate unsupported
$ 
$ 
$ 
$ journalctl -b -2 -p 3
Nov 02 14:00:45 rob-linux kernel: hub 8-0:1.0: config failed, hub doesn't have any ports! (err -19)
Nov 02 14:00:46 rob-linux kernel: 
Nov 02 14:01:10 rob-linux org_kde_powerdevil[1652]: [  1652] busno=5, All features that should not exist detected. Monitor does not indicate unsupported

I did buy a new monitor last week (with a different refresh rate) but it’s been fine until today.

Not sure what this error means?