Re: HDA pin sense and presence detect capability

[Arnaud Patard <apatard@mandriva.com>]

Takashi Iwai <tiwai@suse.de> writes:

> At Wed, 25 Jan 2006 16:34:22 +0100,
> Arnaud Patard wrote:
>> 
>> Hi,
>> 
>> 
>> On some laptops with HDA codecs, there are different nids for the
>> Headphones and for the built-in speakers. This results in having sound
>> on speakers and on headphones at the same time. imho, the expected
>> behaviour is to have sound only on headphones (without having to play
>> with the mixer).
>> 
>> This can be achieve with the presence detect capability (0x709,0xf09): When
>> plug/unplugging the headphones, one gets an unsollicited responsed and
>> the driver mute the channels.
>> 
>> Is there something to do that in the code or should I go and code it ?
>> Any opinion/comments about that ?
>
> You can find an example of such unsolicited event in
> patch_sigmatel.c.

okay. Thanks. 

About what's done in patch_sigmatel.c : what's the point of disabling
the output ? imho, you only need to mute the nid. 

Also, if there are several users of similar functions and on others chips than
sigmatel, shouldn't it be better to put something in hda_codec.c ?


Regards,
Arnaud

>
>
> Takashi



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