Red Hat Bugzilla – Bug 845699
Kernel/Alsa incorrectly detects phased internal microphone (Realteck ALC272X)
Last modified: 2013-08-22 20:43:33 EDT
Description of problem:
Internal microphone doesn't detect sound.
Version-Release number of selected component (if applicable):
All versions tested to date
Steps to Reproduce:
1. open sound settings. No audio is detected on the input tab
No input audio
I'm not entirely sure where this bug exists whether pulseaudio or alsa however what seems to be happening is that it detects a microphone with some kind of noise cancelling channel to be a stereo mic and so locks both channels at the same level, thus cancelling all sound.
Using pavucontrol if you unlock the channels and bring the right channel down, suddenly everything works everywhere as expected.
I found the workaround here: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1002978
So I made a couple mistakes. It seems I was testing against F15 instead of F17. When I upgraded to F17 the microphone no longer works period. The pavucontrol workaround fails to get the microphone working. So the bug still affects F17 but in a different way.
Some additional information which points to perhaps being an alsa/pulseaudio issue. I upgraded a F15 machine's kernel to the same version as F17 (3.5.2). Sound continues to work - albeit while using the workaround described.
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So this issue is still present - in fact I'm unable to work around it now by unlocking the channels as I previously could. I get no audio from microphone no matter what I try...
The attached patch fixes the issue. I've submitted it via email to:
Jaroslav Kysela <email@example.com>
Takashi Iwai <firstname.lastname@example.org>
David Henningsson <email@example.com>
Kailang Yang <firstname.lastname@example.org>
However I don't know when it'll get picked up...
Created attachment 787054 [details]
Patch to get the hardware detected properly...
Congrats Nathanael. Let's get this pulled in until it winds up in stable.
Created attachment 787353 [details]
Yeah its great they included it. Unfortunately after sending that and testing on a couple of machines I had one more type that also needed the same type of patch. I've modified my submitted patch here on bugzilla and emailed email@example.com an updated patch...
kernel-3.10.9-200.fc19 has been submitted as an update for Fedora 19.
kernel-3.10.9-100.fc18 has been submitted as an update for Fedora 18.
kernel-3.10.9-100.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
kernel-3.10.9-200.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.