https://bugzilla.kernel.org/show_bug.cgi?id=74911
--- Comment #5 from Michel Dänzer michel@daenzer.net --- (In reply to Ivan Bulatovic from comment #3)
Apologies, it opts out after a minute just like you've said it would.
Yep, that timeout is one of the biggest downsides of building the driver into the kernel instead of as a module.
I'd say there's no bug here, at least not in the radeon driver.