Am 21.01.2016 um 12:45 schrieb Takashi Iwai:
> On Wed, 20 Jan 2016 19:22:06 +0100,
> Sebastian Wagner wrote:
>>
>> Hi list,
>>
>> the "Acer Aspire V 15 Nitro" has a combined headphone + microphone jack.
>> The headphone worked out-of-the-box (Ubuntu 15.10), but no microphone
>> was recognized. Also, I couldn't find anything about "Realtek ALC255" in
>> my /usr/share/doc/alsa-base/driver/HD-Audio-Models.txt.gz
>>
>> after some googling, I've managed to get my microphone jack working:
>> Adding "options snd-hda-intel model=dell-headset-multi" fixed the issue.
>> See https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1420988
>> for a similar setup. As the bug is still open, I thought this might be
>> of interest.
>>
>> I've attached my alsa-info.txt
> 
> Does the machine have no built-in mic?  In alsa-info.sh output, there
> are only "Headphone Mic" and "Headset Mic" as inputs.
> Also, does the headphone output still works with this quirk?
> 
> In anyway, please give alsa-info.sh output without the model option,
> too.

Hi,

It does, but it is not detected:

* internal speakers are working fine with and without quirk
* internal mic doesn't work
* headphone works with and without quirk
* headset mic only works with quirk.
* I didn't tested anything connected via HDMI

I've attached the alsa-info.txt without option. Also, with the quirk,
the alsamixer input throttles are not very intuitive. I have these
throttles:

1. Headphone Mic boost
2. Capture
3. Capture 1
4. Headset Mic boost
5. Input Source
6. Input Source 1

I'm still trying to find the ones that have an effect.

Sebastian