Sound problem

Takashi Iwai tiwai at
Thu Jan 27 07:27:34 UTC 2011

At Sun, 23 Jan 2011 12:56:29 +0200,
Alex Arnautu wrote:
> I'm testing 2.6.38-rc2, and my microphone is still not working.
> I attached alsa-info.
> I want to mention that 2.6.35 is working fine.

Then please give the output of on both working and
(the latest) non-working versions.

Looking at your output, the machine has three inputs:
one front-mic jack, one rear-mic jack, and one line-in jack.
Which mic jack are you using at all?  And which sound backend is being

Note that the driver provides two analog PCM inputs.  Thus, an app
*might* be opening the secondary stream mistakenly, which you don't
set up properly yet (it's set to Rear Mic, and no gain volume).

Anyway, what you need first is to test with an easier program like
arecord.  Try like
	% arecord -fdat -vv -Dhw:0 foo.wav

If the recording works, the problem isn't about the kernel driver.


> On Wed, Jan 5, 2011 at 3:51 PM, Andy Whitcroft <apw at> wrote:
> >
> > On Tue, Jan 04, 2011 at 06:23:42PM +0200, Alex Arnautu wrote:
> >
> > > I'm having problems with sound. I tested 2.6.35-24 generic and
> > > 2.6.37-rc8. The problem is that on stable version, I can talk with my
> > > friends on GMail or Skype but I can't record sounds with "Sound
> > > Recorder". On the testing version I can't even talk on GMail or Skype
> > > with my microphone. I atached the dmesg files for 2.6.37-rc8 and
> > > 2.6.35-24 generic.
> >
> > If the mic is working in some applications this is much more likely a
> > userspace issue than anything else.  I would recommend filing a bug
> > against 'alsa-driver' for Ubuntu at least as this will get us all of the
> > logs and configurations we need to investigate; you can use 'ubuntu-bug
> > alsa-driver' to file this.
> >
> > -apw

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