> -----Original Message----- > From: Joseph Salisbury [mailto:joseph.salisbury@xxxxxxxxxxxxx] > Sent: Thursday, January 08, 2015 11:26 AM > To: Deucher, Alexander > Cc: stable@xxxxxxxxxxxxxxx; LKML; Koenig, Christian; David Airlie; dri-devel > Subject: Re: [Regression][v3.17][3.18][3.19-rc3] drm/radeon: re-enable dpm > by default on BTC > > On 01/07/2015 09:51 PM, Deucher, Alexander wrote: > > > >> -----Original Message----- > >> From: Joseph Salisbury [mailto:joseph.salisbury@xxxxxxxxxxxxx] > >> Sent: Wednesday, January 07, 2015 5:51 PM > >> To: Deucher, Alexander > >> Cc: stable@xxxxxxxxxxxxxxx; LKML; Koenig, Christian; David Airlie; dri-devel > >> Subject: [Regression][v3.17][3.18][3.19-rc3] drm/radeon: re-enable dpm > by > >> default on BTC > >> > >> 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? > >> > > Does revering b2dccf24e77 help? I'd hate to revert this patch because it > disables power management for a whole family of chips. If it doesn't help I'd > prefer to just add a quirk to disable it for the specific problematic board. > Commit b2dccf24e77 was added to mainline as of v3.18-rc1 and was not > cc'd to stable. We are also seeing this issue in the 3.13.y stable > kernel, which does not have commit b2dccf24e77 applied. However, we can > test reverting it in mainline? Nope. Won't make a difference. The attached patch adds a quirk list for dpm which will fix the issue for the affected boards. Alex > > > > > Alex > > > >> Thanks, > >> > >> Joe > >> > >> [0] http://pad.lv/1386534
Attachment:
0001-drm-radeon-add-a-dpm-quirk-list.patch
Description: 0001-drm-radeon-add-a-dpm-quirk-list.patch
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