https://bugs.freedesktop.org/show_bug.cgi?id=103783
--- Comment #12 from vkrevs@yahoo.com --- Uninstalling tlp and tlp-rdw packages eliminates the error.
What I don't get is that runtime pm for amggpu driver is supposed to be disabled by default according to TLP docs.
I'll try reinstalling TLP and follow the TLP troubleshooting guide to see exactly what setting is causing this.