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Microphone Static After Kernel Update
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daniel4230877
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PostPosted: Thu Sep 12, 2013 12:45 am    Post subject: Microphone Static After Kernel Update Reply with quote

After updating my kernel from 3.2 to 3.11, now the microphones have horrible static sounds when I talk into them, and no one can understand me on Skype because of the static. I figured it must be the new kernel, so I tried my previous kernel and there was still static. There was never static before I updated kernels. What changed when I updated the kernel?
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audiodef
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PostPosted: Sun Sep 15, 2013 3:43 pm    Post subject: Reply with quote

Maybe something in a recent world update you did. Do you know if you updated any alsa drivers or linux-headers?
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PostPosted: Wed Sep 18, 2013 4:17 am    Post subject: Reply with quote

The kernel/software or any digital system cannot make these analog based static noises.

This's a hardware issue. Check earth.
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audiodef
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PostPosted: Wed Sep 18, 2013 1:32 pm    Post subject: Reply with quote

Sure, it can. If the driver is not working properly, you can get poor audio, including what sounds like static, as a result of software drivers not correctly processing audio.
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PaulBredbury
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PostPosted: Wed Sep 18, 2013 5:43 pm    Post subject: Re: Microphone Static After Kernel Update Reply with quote

daniel4230877 wrote:
What changed

ALSA is probably trying to enable more features on your soundcard. Which didn't work out well for you.

Is your ALSA set up to write your asound.state file on shutdown? Keep a copy of that file from when it was clean, if you can.

The motherboard might not be resetting everything after a reboot - to be sure, cut all the power to the motherboard, i.e. mains power, and remove the battery if it's a laptop (doesn't matter about the tiny time-keeping battery on a motherboard). And ALSA may not be resetting everything. This, along with your asound.state file maybe being changed too, explains why reverting back to kernel 3.2 didn't fix the audio when you tried it.

I would recommend kernel 3.10 rather than 3.11 - 3.10 will have long-term support, and 3.11 is too new (and therefore buggy) right now.
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