Background: I was a little adventurous (again) and upgraded to 10.4 alpha, and things are working quite well. The main reason why I upgraded was because I had occasional wireless network problems on 9.10, and it's a bit better in 10.4 (less frequent disconnects that force me to reboot).
My problem: after upgrading, I have no audio. The volume applet seems to be working, and no errors are reported... it's just that it's always completely silent. Any idea why?
I'm on a ThinkPad T400s and the system test identifies my sound card as:
0 [Intel ]: HDA-Intel - HDA Intel
HDA Intel at 0xf2620000 irq 17