[alsa-devel] regression: from 3.8 to 3.9: headphones output no sound on Intel HDA, codec VIA VT1802

Alex Riesen raa.lkml at gmail.com
Wed May 22 23:06:53 CEST 2013

Ping? Can I do something for you?


On Sat, May 18, 2013 at 10:29 PM, Alex Riesen <raa.lkml at gmail.com> wrote:
> Sorry for delayed replies. I have not much time for this lately.
> On Fri, May 17, 2013 at 8:04 AM, Takashi Iwai <tiwai at suse.de> wrote:
>>> Well... It seems that something went unnoticed. This command seems
>>> to be essential for this (and the revised) patch to get the headphone
>>> output at all:
>>>         hda-verb /dev/snd/hwC0D0 0x25 SET_PIN_WID 0xc0
>> Do you mean that the headphone doesn't work without this even after
>> the patch?  It's weird that the alsa-info.sh output you attached below
>> already contains it, i.e. 0x25 showing 0xc0.
> Yes. It is after the latest patch.
>> Or, is the attached output the result after you ran hda-verb like the
>> above?
> Er, yes.
>>> It does. And there is no output from the speakers.
>> Hmm.  I'm confused.  I thought you mentioned that the speaker is
>> unmuted?
> I think I am as confused as you, if not more. I redid the tests
> but recorded everything this time with script(1). It is without
> timing information (would be boring anyway, with me figuring
> the arguments), so just cat it. Just in case: it sets xterm title.
> The transcript is in headphone.gz.
>> - Use the patched kernel, play without headphone, confirm that the
>>   speaker works.  Get alsa-info.sh output at this point.
> That's 3.9.2-wo-headphone.alsa.gz
>> - Plug the headphone, play, and check whether the headphone works and
>>   the speaker is muted.
>>   Again, get alsa-info.sh output at this point, no matter whether the
>>   headphone works or not.
> That's 3.9.2-w-headphone.alsa.gz. Headphone not working, speakers
> correctly muted.
>> In anyway, if you make things working, please give exactly what you
>> did, and take again alsa-info.sh output, too.
> 3.9.2-w-headphone-working.alsa.gz. The working state is lost after
> unplugging and replugging the headphones. It is different to the
> case when the alternate channel is used (Independent HP): replugging
> does not break the output than.
> Sorry for confusion and thanks!
> Regards,
> Alex

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