[Lenovo SL410, Intel 82801I, Mic, Internal] Mic doesn't work

Status changed to 'Confirmed' because the bug affects multiple users.

Hi Javier,

I have now added information on bug 1002978 on how to test for this symptom using Alsamixer. It surprises me a little - the Lenovo SL410 is certified, so it should be working correctly. Maybe the components in SL410 are different although Lenovo uses the same name for it...?

Hello David,

Thanks for answering, I've followed the steps for alsamixer and still doesn't work.

1.- Open alsamixer
2.- F5 to show all controls
3.- Press «c» and later «q» in the capture bar to avoid getting the canceling effect
4.- Press «Esc» to save
5.- arecord -d 5 /tmp/test-mic.wav #to record
6.- aplay /tmp/test-mic.wav #fails

I'm pretty sure it's not a hardware problem, I've run the lucid live cd and the mic works just great there. My machine (except from the cpu) is a clone of the Ubuntu friendly profile I attached.
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Ubuntu Bug Squad volunteer triager
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Hi David,

I've installed the package that you added to the original report #1002978 even when I know it shouldn't fix my problem.., however it did!, I've taken a couple of screenshots to show you how alsamixer behaves

The first screenshot [1] shows alsamixer with the default alsa package in precise, the second one [2] is with your package, I saw that it adds an «Internal Mic Boost» control that when enabled makes the mic works.

So I suspect it's not a inversion problem but another one.

I'd be glad to send you any information to get it fix it for real in precise, thanks for your work!

[1] http://i.imgur.com/nEz56.png
[2] http://i.imgur.com/ncNQt.png
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Ubuntu Bug Squad volunteer triager
http://wiki.ubuntu.com/BugSquad

Hmm, could you try the following:

1) Uninstall the dkms package so you have a clean precise kernel.
2) Add this row to /etc/modprobe.d/alsa-base.conf
options snd-hda-intel model=auto
3) reboot

Is this making internal mic work (without causing other changes/regressions for other outputs/inputs)?

Hi David,

Yep, it fixed too, wop, I should had manage to fix it, unfortunately I know nothing about the sound system, so, I suppose this don't quality as a bug..

Thanks for your patient!
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Ubuntu Bug Squad volunteer triager
http://wiki.ubuntu.com/BugSquad

Thanks. To summarize, this computer needs needs model=auto for 12.04/3.2 kernels, and will very likely work by default on the 12.10 kernels.

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Expired for alsa-driver (Ubuntu) because there has been no activity for 60 days.]