[alsa-devel] [PATCH] fix headphone settings and master volume (Conexant CX20551 0x103c30b2)

[Takashi Iwai]

At Thu, 12 Mar 2009 15:35:37 +0100,
Gregorio Guidi wrote:
> 
> On Thursday 12 March 2009 15:18:56 Takashi Iwai wrote:
> > At Thu, 12 Mar 2009 15:00:35 +0100,
> >
> > Gregorio Guidi wrote:
> > > On Thursday 12 March 2009 07:43:27 Takashi Iwai wrote:
> > > > At Wed, 11 Mar 2009 22:22:39 +0100,
> > > >
> > > > Gregorio Guidi wrote:
> > > > > On Tuesday 10 March 2009 15:49:38 Takashi Iwai wrote:
> > > > > > At Mon, 9 Mar 2009 20:19:35 +0100,
> > > > > >
> > > > > > ...
> > > > > >
> > > > > > Thanks, that helps for debugging.
> > > > > >
> > > > > > Looking through the current patch_conexant.c, there are other messy
> > > > > > codes there, too.  So I cleaned up and fixed it on sound git tree
> > > > > > now.  Any chance to try it out?  The GIT tree is found at:
> > > > > >
> > > > > >   
> > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6.git
> > > > >
> > > > > I managed to test a kernel snapshot with the latest changes, thanks
> > > > > for taking the time to refactor and clean up the code there.
> > > >
> > > > Thanks for testing.
> > > >
> > > > > There are still issues, though: at the moment, the "Speaker" control
> > > > > does not work. Consequently, automute does not work and Master only
> > > > > controls headphones.
> > > >
> > > > Hm, doesn't "Speaker" give any change if you unplug the headphone?
> > > > It should change the output volume of widget 0x1d.  If it's true, there
> > > > can be a few reasons:
> > > >
> > > > A. The real speaker output pin isn't 0x1d but another pin
> > > >
> > > > B. The widget 0x1d has a problem with connection to 0x19
> > > >
> > > > C. The widget 0x1d has no output amp control despite the description
> > >
> > > To clarify: the speakers make sounds, but volume control and muting do
> > > not work.
> > >
> > > Actually, now that I start to understand how these widget connections
> > > work, I see the problem is simpler: after changing the 0x1d connection
> > > (routing the speakers to 0x19) with {0x1d, AC_VERB_SET_CONNECT_SEL, 0x1},
> > > you have to update the other places where the 0x1d widget is used (see
> > > patch). This also explains the problem originally reported where
> > > Headphone didn't work (here and in bug #3091).
> > >
> > > With just the following patch applied on top of the git tree everything
> > > works nicely (Headphone, Speaker, Master, automute all work as expected).
> >
> > Wow, that's a nice finding!  Yes, this explains everything.
> >
> > In the HD-audio specification, the amp volume selection of a pin
> > widget is defined ambiguously.  Usually, the input amp takes the
> > index, at least for other widget types.  However, the input amp for a
> > pin widget means the recording (the "input" from the pin jack) while
> > the output amp corresponds to the output level from the jack.  So,
> > there is an inconsistency in the definition.
> >
> > Normally, the other vendors don't use the index for the pin output
> > amp -- i.e. no index selection for output amps.  But it seems that
> > conexant codec uses it.  That's why we are fooled by this for such a
> > long time...
> >
> > Anyway, the patch looks good.  Could you give your sign-off?
> 
> Sure.
> 
> Update the places where the 0x1d widget is used for Conexant 5047, fixing 
> mismatch introduced after changing the connection.
> 
> Signed-off-by: Gregorio Guidi <gregorio.guidi at gmail.com>

Thanks, applied now.


Takashi