My speakers work correctly when the audio profile in the System Sound Settings dialog is set to "Analog Stereo Output". The internal microphone works when the profile is set to Digital Stereo (IEC958) Output + Analog Stereo Input, however the speakers then stop working. The other available profiles are no better.
I believe this started when I updated to 11.10. I've tried adjusting settings with pavucontrol without any luck.
The hardware in the ThinkPad T400 is:
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03) Subsystem: Lenovo Device 20f2 Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at fc020000 (64-bit, non-prefetchable) [size=16K] Capabilities:  Power Management version 2 Capabilities:  MSI: Enable- Count=1/1 Maskable- 64bit+ Capabilities:  Express Root Complex Integrated Endpoint, MSI 00 Capabilities:  Virtual Channel Capabilities:  Root Complex Link Kernel driver in use: HDA Intel Kernel modules: snd-hda-intel
How can I create or obtain a profile where the input and output both work simultaneously?