https://bugs.freedesktop.org/show_bug.cgi?id=91880
--- Comment #161 from garththeisen@hotmail.com --- Not sure how well a bug bounty might work for this issue, but would there be any interest? Maybe a fund for hardware purchase (R9 390) to send to someone with the expertise to diagnose/fix work against.
I'm willing to chip in with the hope of seeing some progress and resolution.