[pulseaudio-discuss] [PATCH] alsa-mixer: recognize Dock headphone jack

[Alexander E. Patrakov]

01.09.2014 12:30, Sjoerd Simons wrote:
> On Mon, 2014-09-01 at 07:54 +0200, David Henningsson wrote:
>>
>> On 2014-08-31 20:11, Sjoerd Simons wrote:
>>> Recognize the Dock headphone jack in the same way the normal & front
>>> headphone jacks are detected.
>>
>> Hi Sjoerd,
>>
>> The reason "Headphone" and "Front Headphone" are both in the same path,
>> is because they're often mixed, i e, the jack is called "Front
>> Headphone" but the volume control is called only "Headphone".
>>
>> I'm not sure this is also the case for "Dock Headphone". In the case it
>> isn't, "Dock Headphone" would need its own path rather than being
>> integrated with the normal headphones path.
>>
>> Could you check this?
>
> I actually started it out as its own path, only to discover i couldn't
> unmix them/mute them seperately :/.. So yes this is definitely the case
> for at least my X220T + dock. As far as i could tell from the kernel HDA
> sources it seems that all headphone outputs always tend to get setup as
> mixed (although i could well be wrong here).
>
> I'd actually would like them to not be seperately switchable (Such that
> e.g. headphones on the laptop can get priority over headphones on the
> dock) or rather, have the dock jack turn off when the laptops headphones
> are plugged. But it looks like that needs some kernel patching to add
> controls to change the HDA routing/pin setup to make that happen.

Out of interest, may I look at the codec files for the X220T, both for 
"docked" and "undocked" cases? (/proc/asound/card0/codec\#0 or something 
similar)

-- 
Alexander E. Patrakov