https://bugs.freedesktop.org/show_bug.cgi?id=103370
--- Comment #17 from Shih-Yuan Lee fourdollars@gmail.com --- Created attachment 135027 --> https://bugs.freedesktop.org/attachment.cgi?id=135027&action=edit Xorg.0.log
(In reply to Mike Lothian from comment #15)
Are there any changes when you boot the system with radeon.runpm=0, this will mean the card never powers down
What distro are you running?
You mention trying older kernel version, did you try older mesa versions too?
Can you attach your Xorg.0.log too
radeon.runpm=0 doesn't make any change.
I am running Ubuntu 16.04 LTS which using Linux kernel 4.4 and Mesa 11.2.0 before upgrading the system. After the system upgraded, it uses Mesa 17.0.7 instead.