

Since you specifically mention qtile you should undo your customizations and see if that fixes your problem?
If not, you should look at the journal after reboot:
journalctl -b
But you’ll need to filter it.
Try journalctl -b | grep -v rtkit-daemon, which will remove the masses of entries you bemoaned in another comment (AFAICS all syslog entries should also be in the journal anyhow).
Very important:
Please make note of when the problem happened, and if your journal entries even go that far in time.


Nice, that looks pretty obvious.
In addition to the other reply, you should search around your distro* having problems with (certain) AMD gpus; maybe all you need is a backported kernel.
* I don’t think you ever mentioned. If it’s Ubuntu-based, search for Ubuntu.