Hi Alexander, A kernel bug report was opened against Ubuntu [0]. After a kernel bisect, it was found that reverting the following commit resolved this bug: commit c08abf11900e19b14dd3a0cc3d105bd74519cd18 Author: Alex Deucher <alexander.deucher@xxxxxxx> Date: Mon Jul 14 12:01:40 2014 -0400 drm/radeon: re-enable dpm by default on BTC The regression was introduced as of v3.17-rc1 and still exists in current mainline. It has also made it's way into the stable releases. I was hoping to get your feedback, since you are the patch author. Do you think gathering any additional data will help diagnose this issue, or would it be best to submit a revert request? Thanks, Joe [0] http://pad.lv/1386534 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html