linux-kernel - Re: [regression] Sound not transferred to docking station after resume from StR

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Message-Id: <201004171106.23787.elendil@planet.nl>
Date:	Sat, 17 Apr 2010 11:06:22 +0200
From:	Frans Pop <elendil@...net.nl>
To:	linux-kernel@...r.kernel.org
Cc:	linux-pm@...ts.linux-foundation.org, alsa-devel@...a-project.org,
	Takashi Iwai <tiwai@...e.de>
Subject: Re: [regression] Sound not transferred to docking station after resume from StR

On Friday 16 April 2010, Frans Pop wrote:
> Scenario:
> - suspend laptop while *un*docked, i.e. with laptop speakers in use
> - dock laptop
> - resume
>
> With 2.6.33 and earlier the sound would always come from the external
> speakers connected to the docking station. But with 2.6.34-rc4 I get
> sound still coming from the laptop's internal speakers, which is not
> correct.

The problem is slightly different than I thought. Turns out *both* the
internal (laptop) and external (docking station) speakers are active after
the resume. So the problem is that the internal speakers are not switched off.

I have traced this to an ALSA merge: 524df55725217. Unfortunately I get
boot failures when I try to bisect down into that merge.

Here's the bisect log:
# bad: [0d0fb0f9c5fddef4a10242fe3337f00f528a3099] Linux 2.6.34-rc4
# good: [724e6d3fe8003c3f60bf404bf22e4e331327c596] Linux 2.6.33-rc8
git bisect start 'v2.6.34-rc4' 'v2.6.33-rc8'
# bad: [94468080220162f74dc6ce5c3e95e5fec8022902]
  Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
git bisect bad 94468080220162f74dc6ce5c3e95e5fec8022902
# bad: [524df55725217b13d5a232fb5badb5846418ea0e] Merge branch 'for-linus'
  of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
git bisect bad 524df55725217b13d5a232fb5badb5846418ea0e
# good: [0f4533979473a456a8adb3869365e12c7a99cf65]
  Merge branches 'futexes-for-linus', 'irq-core-for-linus' and
  'bkl-drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
git bisect good 0f4533979473a456a8adb3869365e12c7a99cf65

Cheers,
FJP
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