I've started running into a kind of strange problem on my laptop, and Google hasn't proved to be very helpful so far.
Essentially, at seemingly random times, my microphone will start sending output directly to my speakers/headphones and I cannot disable it. Going through the Gnome GUI and muting my microphone doesn't stop the sound, and disabling the capture channel in
alsamixer doesn't help either. For that matter, I can set every channel to a level of "0" in
alsamixer, but if I unmute the master I'll still hear microphone input.
So far the only thing that solves the issue is rebooting my system, but that's clearly an inconvenient "workaround" for the problem. If I was on a desktop this might not bother me much, but my mic is integrated into my laptop so my typing and touchpad clicks get picked up and amplified right through my headphones (which is incredibly annoying, obviously).
This is on a fairly fresh Fedora 14 install, but the problem started on 13.
alsa-info report my sound card as:
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
lsmod notes that the
snd_hda_intel module is loaded.
Has anybody experienced this before? Any helpful hints? It might very well be a simple solution, but I just can't seem to figure out what it is.