Comment 2 for bug 226684

This happened minutes ago, I was playing Frozen Bubble and talkins with a friend of mine in Pidgin, then suddenly was only able to listen to th sounds that came from Frozen, not form Pidgin. I take a look at /var/log/messages which gave me this:

gsanchez@ubuntu:~$ tail /var/log/messages
May 8 21:20:55 ubuntu kernel: [ 50.940366] Bluetooth: RFCOMM ver 1.8
May 8 21:20:58 ubuntu kernel: [ 53.311909] agpgart: Found an AGP 2.0 compliant device at 0000:00:00.0.
May 8 21:20:58 ubuntu kernel: [ 53.311932] agpgart: Putting AGP V2 device at 0000:00:00.0 into 4x mode
May 8 21:20:58 ubuntu kernel: [ 53.311989] agpgart: Putting AGP V2 device at 0000:01:00.0 into 4x mode
May 8 21:40:53 ubuntu -- MARK --
May 8 22:00:53 ubuntu -- MARK --
May 8 22:20:53 ubuntu -- MARK --
May 8 22:40:53 ubuntu -- MARK --
<b>May 8 22:44:59 ubuntu pulseaudio[5435]: pstream.c: Failed to import memory block.</b>
May 8 22:54:50 ubuntu kernel: [ 5678.400148] sr0: CDROM not ready. Make sure there is a disc in the drive.

As a workaround, is there any way of disabling pulse audio as sound system and revert it to Alsa as the way it was before 8.04?