Comment 1 for bug 569671

I am experiencing this issue as well with 10.04 release, more specifically with pulseaudio version 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu14. It does look like bug #417976 which is supposed to be fixed.

Sound device:

0:08.0 Audio device: nVidia Corporation MCP79 High Definition Audio (rev b1)
 Subsystem: Acer Incorporated [ALI] Device 0222
 Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 21
 Memory at fae78000 (32-bit, non-prefetchable) [size=16K]
 Capabilities: [44] Power Management version 2
 Kernel driver in use: HDA Intel
 Kernel modules: snd-hda-intel