After trying to unsuccessfully install OSS4, it seems I've broken ALSA and have no sound. I've uninstalled the oss4 packages and rebooted, and now alsamixer reports "cannot open mixer: no such file or directory". Here's the output of aplay -l:
PulseAudio also doesn't find any hardware devices, though it is able to play to the Apple Airport Express down the hall.
**** List of PLAYBACK Hardware Devices ****
aplay: device_list:244: snd_ctl_pcm_next_device
I'm running 10.04 64-bit on a Thinkpad X61.
Any help very much appreciated.