https://bugs.freedesktop.org/show_bug.cgi?id=100759
--- Comment #1 from Nicola Mori nicolamori@aol.com --- I found the time to bisect and found that the culprit is:
commit 1c331f75aa6ccbf64ebcc5a019183e617c9d818a Author: Lucas Stach dev@lynxeye.de Date: Sun Oct 23 01:05:33 2016 +0200
drm/radeon/pm: autoswitch power state when in balanced mode
The current default of always using the performance power state leads to increased power consumption of mobile devices, which have a dedicated battery power state. Switch between the performance and battery power state automatically, dpending on the current AC power status, when the user asked for the balanced power state.
The user can still override this logic by asking for the performance or battery power state explicitly.
Tested-by: Michel Dänzer michel.daenzer@amd.com Acked-by: Christian König christian.koenig@amd.com Signed-off-by: Lucas Stach dev@lynxeye.de Signed-off-by: Alex Deucher alexander.deucher@amd.com
I don't have the skills to understand what's broken, but I can test an eventual patch if someone provides it. Thanks.