I have the same issue with the same hardware. Running latest (21/10) updated karmic beta. The external jack microphone works fine. I have noticed one thing though. If I run gnome alsa mixer with working microphone I get picture like the first screenshot: the mic and capture channels are switched on recording and PA control shows signal from the ext mic. When I switch internal Mic checkbox I get the second screen: BOTH mic & Capture channels are switched off (rec) and in PA sound control the Mute checkbox appears. There is no signal from the internal mic. If I switch capture rec on in gnome-alsamixer (third screen) there is still no signal in PA control and no signal from the mic and the Mute check stays put. If I unmute the PA control in the right window the Internal mic is switched off and mic switched on - back to the first screen situation. It is the same if I put model=thinkpad in alsa-base.conf or not.
** Attachment added: "Working external mic" http://launchpadlibrarian.net/34104619/external_mic_working.png -- Internal microphone does not work https://bugs.launchpad.net/bugs/440251 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs