> -----Original Message----- > From: Joseph Salisbury [mailto:joseph.salisbury@xxxxxxxxxxxxx] > Sent: Thursday, January 08, 2015 4:58 PM > 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 01/08/2015 12:48 PM, Deucher, Alexander wrote: > >> -----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 > Thanks again for the patch, Alex. The bug reporter has tested a 3.16 > kernel with the patch and says it fixes the bug. I'll queue it up for 3.19-fixes and cc stable. Thanks, Alex > > > > > >>> Alex > >>> > >>>> Thanks, > >>>> > >>>> Joe > >>>> > >>>> [0] http://pad.lv/1386534 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
