Originally Posted by Cygn
run "alsamixer -c0" in a terminal. Press F4 then lower to zero all capture channels' left inputs by pressing "z".
if you're using skype, don't let it adjust sound levels, there's a checkbox for that somewhere.
alsamixer -c0 shows:
Card: HD-Audio Generic F1: Help │
│ Chip: ATI R6xx HDMI F2: System information │
│ View: F3: Playback F4: Capture F5:[All] F6: Select sound card │
│ Item: S/PDIF Esc: Exit │
Below is a box containing "00", underneath of which is "<s/pdif>"
alsamixer -c1 shows:
Card: HDA ATI SB F1: Help │
│ Chip: Conexant ID 506c F2: System information │
│ View: F3:[Playback] F4: Capture F5: All F6: Select sound card │
│ Item: Master [dB gain: 0.00, 0.00] Esc: Exit │
│ with bars for <Master> and PCM.
F4 shows capture, mic and mic1.
Mic works great in Windows, but not in Fedora.