linux-kernel - Re: snd_hda_intel headphone output disabling upon complete insertion of plug

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Date:	Fri, 11 Oct 2013 11:46:51 -0500
From:	lkml@...garu.com
To:	Mark Knecht <markknecht@...il.com>
Cc:	Linux Kernel List <linux-kernel@...r.kernel.org>
Subject: Re: snd_hda_intel headphone output disabling upon complete insertion of plug

On Tue, Oct 08, 2013 at 02:34:33PM -0700, Mark Knecht wrote:
> On Tue, Oct 8, 2013 at 2:07 PM,  <lkml@...garu.com> wrote:
> > Hello list,
> >
> > Somewhere between 3.11.0-rc7-gfa8218d and 3.12.0-rc4-g8b5ede6 this
> > broke.
> >
> > The machine is an x61s thinkpad, with the headphone output unmuted and
> > headphones partially inserted sound is audible.  If the output is muted,
> > the output shuts off.  With the output unmuted, upon inserting the
> > headphone plug fully the output shuts off following a blink of a delay.
> > If I slowly remove the headphone plug returning it to a partially inserted
> > state, the audio returns after another delay.
> >
> > It seems like a bug in the headphone amplifier power management, as if
> > it's doing the inverse of what it needs to do.  I'll try find time to
> > bisect, just wanted to get this out there though in case any of you
> > recognize the problem and know what might have caused it.
> >
> > Regards,
> > Vito Caputo
> 
> Sometimes across kernel revisions I've had problems like this.
> (Although not that specific one!) It seems that the asound.state file
> format changes and alsa renumbers their internal controls. You might
> try saving the existing file elsewhere and then setting up alsa again
> from scratch. That solved my last problem of that type.
> 

NAK, has no effect.  Looking at the diff between the revisions under
sound/pci/hda there appears to be quite a bit of activity.  Hopefully I
can get around to bisecting this weekend.  Leaving the headphones 90%
inserted is workable for now.

Regards,
Vito Caputo
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