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I have a Lenovo x230 running Ubuntu 12.04.3 (and previously 12.04.2).

I had been trying to use audacity to record audio from a stream on a website and ever since the internal mic has been problematic.

For the most part the microphone does not register any input on the internal devices tab of pavucontrol and if I try to use something like skype the other end just hears static.

I have had some success getting mic input working by changing settings in alsamixer but again there does not seem to be anything reproducible to make this happen and it is not permanent, typically putting the computer to sleep or rebooting and I am back to square one.

Would anyone have any suggestions on how to reset the microphone or reconfigure it to consistently work or even ideas for further troubleshooting?

$ uname -a
Linux laptop 3.5.0-39-generic #60~precise1-Ubuntu SMP Wed Aug 14 15:38:41 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.3 LTS
Release:    12.04
Codename:   precise
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I had a problem with microphone not working after hibernation, the fix was to go to pavucontrol > Input Devices > Port > change to "Microphone" and then back to "Internal Microphone" and it starts working again. –  Czarek Tomczak Oct 16 '13 at 22:44
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