[alsa-devel] [PATCH] ALSA: HDA: Fix mic initialization in VIA auto parser (was: pci/hda/patch_via.c - broken between 2.6.36 and 2.6.37 (bisected))

Mark Goldstein goldstein.mark at gmail.com
Wed Mar 23 11:58:36 CET 2011

On Wed, Mar 23, 2011 at 12:41 PM, Wolfgang Scheicher
<wolfgang.scheicher at gmail.com> wrote:
> Wolfgang Scheicher wrote:
>> David Henningsson wrote:
>>> On 2011-02-21 09:43, Mark Goldstein wrote:
>>>> [...]
>>>> I've never dealt with submitting patches, so probably it'll be better
>>>> (and definitely faster) if you could do it.
>>>> Thank you,
>>> Ok, here comes the patch!
>> Tested, and Microphone now works! Thanks a lot to everyone involved.
>> Good job so far!
> Hmm ... Just tried kernel 2.6.38 from debian sid, and Microphone is not
> working again. However, this fix is in.
> What might have broken it this time?
> I hope to find some time to track down the commit somewhen the next days ...


When I was fighting with Mic issue, I used hda-analyser script. Try it
and check how the pin 0x1e (Front Mic) is configured.
My symptom was that this pin has been initiated with VREF Hi-Z.
If you see that, try changing it to VREF 50. Mic should start working.

Mark Goldstein

More information about the Alsa-devel mailing list