Conexant CX20561 alsa driver not muting headphone jack on Thinkpads when mute button pressed .. any ideas?

Conexant CX20561 alsa driver not muting headphone jack on Thinkpads when mute button pressed .. any ideas?

[Jerone Young]

There is an interesting problem with Lenovo Thinkpads X200, X200s, X301,
& .. looks like W500  using the Conexant CX20561 codec under Linux with
alsa.

But if you have your headphone plugged in. You get audio .. but if you
press the hardware mute button .. it will not mute the headphones. By
pulling out the headphones you will notice though that the internal
speakers are muted.

At first I blamed the bios. But then I did a test under FreeDOS where I
used the beep command for sound. Sure enough I press the mute button and
the headphone jack is muted.

I've been looking for any documentation I can find on the CX20561 but
there is non out there I can find. I could be wrong, but it seems some
bit isn't being flipped for this codec to work correctly with this
functionality with the alsa driver.


Any ideas?

I've created a bug here:
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4928

			Thanks,
				Jerone

Re: Conexant CX20561 alsa driver not muting headphone jack on Thinkpads when mute button pressed .. any ideas?

[Jerone Young]

So I believe I know the answer (or almost) to the problem. The problem
is the speaker & headphones DACs are not being mixed on the same mixer.

The problem is to figure out which mixer does this I need the spec for
the codec.

Does anyone know I can get a hold of data sheet for the Conexant CX20561
or CXT5051 ?


				Thanks,
					Jerone

On Mon, 2010-02-22 at 17:55 -0600, Jerone Young wrote:
> There is an interesting problem with Lenovo Thinkpads X200, X200s, X301,
> & .. looks like W500  using the Conexant CX20561 codec under Linux with
> alsa.
> 
> But if you have your headphone plugged in. You get audio .. but if you
> press the hardware mute button .. it will not mute the headphones. By
> pulling out the headphones you will notice though that the internal
> speakers are muted.
> 
> At first I blamed the bios. But then I did a test under FreeDOS where I
> used the beep command for sound. Sure enough I press the mute button and
> the headphone jack is muted.
> 
> I've been looking for any documentation I can find on the CX20561 but
> there is non out there I can find. I could be wrong, but it seems some
> bit isn't being flipped for this codec to work correctly with this
> functionality with the alsa driver.
> 
> 
> Any ideas?
> 
> I've created a bug here:
> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4928
> 
> 			Thanks,
> 				Jerone
> 
> 
> 
> 
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