[alsa-devel] No jack sense on Intel 82801I / IDT 92HD71B7X in a HP dv4

Takashi Iwai tiwai at suse.de
Fri Jun 5 21:40:10 CEST 2009

At Fri, 05 Jun 2009 14:48:41 -0300,
Gustavo Maciel Dias Vieira wrote:
> Em Ter, 2009-06-02 às 14:10 -0300, Gustavo Maciel Dias Vieira escreveu:
> > Em Qua, 2009-04-29 às 08:37 +0200, Takashi Iwai escreveu:
> > >
> > > OK, it means that the unsolicited event isn't processed properly
> > > at jack plugging.  But still strange why alsa-info.sh can trigger it.
> > > 
> > > Could you put some debug print to the unsol even handler to see
> > > whether you get any even when you plug the jack?
> > > 
> > 
> > The stac92xx_unsol_event() isn't called when the jack is plugged. It is
> > called twice at kernel boot (HP_EVENT and then INSERT_EVENT), and it is
> > called three times when running alsa-info (all HP_EVENT, regardless if
> > the HP is plugged or not).
> > 
> > These results may not be entirely accurate as the current snapshot
> > isn't working correctly. It just plays the first second of audio and
> > keeps looping, locking the application (with and without pulseaudio).
> > 
> > If it would help you, I could try to debug stac92xx_unsol_event() in the
> > current Fedora kernel (, as the sound works with it and the
> > jack sensing don't.
> I repeated the experiment with the Fedora kernel The results
> are exactly the same. stac92xx_unsol_event() isn't called when the jack
> is plugged or unplugged, and alsa-info triggers a number of HP_EVENTs.
> However, this time I made an interesting observation. alsa-info does not
> generate spurious events. It generates exactly the number of events that
> should be generated before the execution of alsa-info. For example: if I
> plug and unplug the HP and run alsa-info, two HP_EVENTs are generated.
> This explains the three events I observed earlier (plug, unplug, plug,
> alsa-info).
> It seems the events are getting "stuck" somewhere and alsa-info
> "releases" them.

Check /proc/interrupts whether you get an interrupt when you plug /
unplug the jack.  I guess you don't get an interrupt there.  If so,
then it's a problem of ACPI or BIOS.  If you get a proper interrupt
but still no unsol event is passed, something wrong in the sound
driver side.

BTW, I guess the similar effect could be achieved instead of alsa-info
but by just changing the mixer volume once.  The unsol verbs were
delivered, but they aren't fed until any sync operation is done.


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