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

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Message-ID: <20140528234927.GA18638@milliways>
Date:	Thu, 29 May 2014 00:49:27 +0100
From:	Ken Moffat <zarniwhoop@...world.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Alex Deucher <alexdeucher@...il.com>
Subject: Re: Resume from suspend broken in 3.15. (bisected)

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.

> 
>  The processor is an AMD A4 APU.  The symptoms after this commit are
> that pm-suspend works (I invoke it from my keyboard's sleep key),
> i.e. the power LED on the case goes out and the monitor goes black
> and reports no signal.  When I press a key to resume, the power LED
> comes on but the screen stays black.  Magic-SysRQ does not work and
> I have to use the case switch to reboot.  That results in filesystem
> errors which fsck fixes and warns about (probably, just a sign of
> unclean shutdown).
> 
>  The only thing in the log are a couple of messages from EXT4 at the
> end of putting the box to sleep -
> May 28 16:19:02 bluesbreaker kernel: [   39.440859] EXT4-fs (sda10): re-mounted. Opts: commit=0
> May 28 16:19:02 bluesbreaker kernel: [   39.592318] EXT4-fs (sda13): re-mounted. Opts: commit=0
> May 28 16:20:05 bluesbreaker syslogd 1.5.0: restart.
> 
>  What can I do to help debug this ?
> 
ĸen
-- 
Nanny Ogg usually went to bed early. After all, she was an old lady.
Sometimes she went to bed as early as 6 a.m.
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