If you have an 'Analog Mix' or 'AC97' mixer element(s) for your SB Live, setting the Playback to 0 and muting both (or the relevant existing one for your codec) should resolve this issue.
** Changed in: linux-source-2.6.15 (Ubuntu) Importance: Medium => Low Status: Confirmed => Needs Info -- Cannot mute microphone with Sound Blaster Live! https://launchpad.net/bugs/25022 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs