Clevo P177SM, these two GPUs: 00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06) 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Neptune XT [Radeon HD 8970M] (rev ff) With kernel 4.5.1 the Radeon card is always on. Reverting 5a427809cd9143bef89ee3110f45e84f37484218 fixes the problem.
Duplicate of bug 115321. (In reply to Eugene Shalygin from comment #0) > With kernel 4.5.1 the Radeon card is always on. Reverting > 5a427809cd9143bef89ee3110f45e84f37484218 fixes the problem. I did warn Greg KH about this regression, but it looks like he backported the change anyway. :(
Please attach your full dmesg output.
Created attachment 212691 [details] dmesg dmesg with the commit reverted
Created attachment 212711 [details] possible fix Please apply this patch on top of the patches from bug 115321.
With the quirk it works, thank you.
The issue is present on Dell Latitude E6540 (Debian Testing installed). 00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06) 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mars XTX [Radeon HD 8790M] (rev ff) Some more discussions about this here: https://www.phoronix.com/forums/forum/linux-graphics-x-org-drivers/open-source-amd-linux/867738-kernel-4-5-radeon-runpm-not-working-properly-on-debian-testing
The patch has been reverted: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bfaddd9fc8ac048b99475f000dbef6f08297417f and will be reverted in stable branches as well.
Works in 4.6.0