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Message-ID: <A3397C8B8B789E45844E7EC5DEAD89D0635DD4D6@satlexdag06.amd.com>
Date: Thu, 8 Jan 2015 02:51:45 +0000
From: "Deucher, Alexander" <Alexander.Deucher@....com>
To: Joseph Salisbury <joseph.salisbury@...onical.com>
CC: "stable@...r.kernel.org" <stable@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
"Koenig, Christian" <Christian.Koenig@....com>,
David Airlie <airlied@...ux.ie>,
dri-devel <dri-devel@...ts.freedesktop.org>
Subject: RE: [Regression][v3.17][3.18][3.19-rc3] drm/radeon: re-enable dpm
by default on BTC
> -----Original Message-----
> From: Joseph Salisbury [mailto:joseph.salisbury@...onical.com]
> Sent: Wednesday, January 07, 2015 5:51 PM
> To: Deucher, Alexander
> Cc: stable@...r.kernel.org; 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@....com>
> 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.
Alex
>
> Thanks,
>
> Joe
>
> [0] http://pad.lv/1386534
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