Created attachment 133782 [details]
dmesg

Current amd-staging-drm-next branch has some issues with hawaii/CI R9 290 gpu,
there is a lot of backtrace noise in the dmesg (see attachment) and some
related messages during the boot. I'll add a dmesg right after the boot as
well.

There are also some issues with suspend/resume which are possibly related,
though not sure.

The problem appeared since the beginning of the August, IIRC. Everything was
more stable previously, but it's hard to double-check older versions as long as
the branch is usually force-pushed.