no sound after routine upgrade

[Tim Folger <timfolger@gmail.com>]

HI,
 
I'm running sid with the 2.6.16 kernel and kde 3.5.2 on an HP laptop with an 
AC'97 sound card. Sound had been working perfectly, but this morning I did an 
aptitude update and upgrade and since then have lost all sound. I've run 
alsaconf, and get no error messages. But when I try to use kde's control 
center to start the sound system, I keep getting sigserv messages that the 
soundserver has crashed.
 
 I'd appreciate any advice.
 
 Thanks,
 
 Tim