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SubjectResume from suspend broken in 3.15. (bisected)
Hi Daniel,

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@ffwll.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)


I have attempted to revert this commit from Linus' current tree,
but git considered that there was a conflict, and I did not know how
to address it, so I aborted. The conflict is :

<<<<<<< HEAD

if (connector->dpms != DRM_MODE_DPMS_ON) {
DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
mode_changed = true;
}

=======
>>>>>>> parent of 25f397a429df... drm/crtc-helper: explicit DPMS on
>>>>>>> after modeset
break;
}
}


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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