linux-kernel - Re: Resume from suspend broken in 3.15. (bisected)

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Message-ID: <CADnq5_NxXDfGEquFZX_CnhNEAKEomijQCX+Hn3kQhAFBZOge1g@mail.gmail.com>
Date:	Thu, 29 May 2014 16:47:12 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Ken Moffat <zarniwhoop@...world.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Resume from suspend broken in 3.15. (bisected)

On Thu, May 29, 2014 at 2:03 AM, Dan Carpenter <dan.carpenter@...cle.com> wrote:
> On Wed, May 28, 2014 at 08:26:53PM -0400, Alex Deucher wrote:
>> On Wed, May 28, 2014 at 7:49 PM, Ken Moffat <zarniwhoop@...world.com> wrote:
>> > On Wed, May 28, 2014 at 06:25:21PM +0100, Ken Moffat wrote:
>> >> Hi Daniel,
>> >>
>> >
>> >  [ correcting details, confirming that reverting this does fix the
>> > problem, adding Cc:s ]
>> >
>> >>  I've only started full testing of 3.15 on one of my machines now
>> >> that -rc7 has been released (this one had two issues in the radeon
>> >> code, second was fixed in rc7).  Unfortunately, suspend to RAM
>> >> (pm-suspend), or rather the wake-up, is broken on this box [ my
>> >> other two boxes are fine in rc7 ].
>> >>
>> >> Bisection identified one of your commits -
>> >>
>> >> commit 25f397a429dfa43f22c278d0119a60a343aa568f
>> >> Author: Daniel Vetter <daniel.vetter@...ll.ch>
>> >> Date:   Fri Jul 19 18:57:11 2013 +0200
>> >>
>> >>     drm/crtc-helper: explicit DPMS on after modeset
>> >>
>> >>     Atm the crtc helper implementation of set_config has really
>> >>     inconsisten semantics: If just an fb update is good enough, dpms state
>> >>     will be left as-is, but if we do a full modeset we force everything to
>> >>     dpms on.
>> >>
>> >>     This change has already been applied to the i915 modeset code in
>> >>
>> >> ('git show' stops at that point)
>> >
>> >  update : I've no idea what was going on there, nor for the problem
>> > with attempting to revert it.  I've now gone back into git,
>> > extracted the full commit to a file with 'git show', and then used
>> > git apply -R to revert it from 3.15-rc7.  That version wakes up from
>> > suspend to RAM, 3.15-rc7 itself did not.
>> >
>> >  Maybe I was still in git log when I thought I was on the command
>> > line.  Anyway, snipping git's view of my failed attempt to revert
>> > it, and adding Dan and Alex who were CC'd on the commit.
>> >
>>
>> Duplicate of:
>> https://bugzilla.kernel.org/show_bug.cgi?id=74751
>> and also reported here:
>> https://lkml.org/lkml/2014/5/2/388
>> Unless there is a good reason to keep the commit, I'd say let's just revert it.
>>
>
> Yes.  Let's revert it.

The actual bad commit is 177cf92de4aa97ec1435987e91696ed8b5023130, but
for some reason git bisect always comes up with
25f397a429dfa43f22c278d0119a60a343aa568f which has been in the tree
for almost a year now.  I don't know why.

Alex


>
> regards,
> dan carpenter
>
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