Comment 8 for bug 544228

Another data point. I booted off both a DVD and USB stick with Lucid 10.04 daily build 3/25/2010 8:13am. In both cases, there is no sound on my system (HP Pavillion a6430f) 64-bit) from anywhere(speakers and/or headphone). The up/down volume buttons provide feed back that pressing the buttons is responding, but there is still no sound. When I get the sound restored (first two steps in obtaing verbose log), System->Preferences->Sound does not respond nor do the up/down volume and mute buttons have any effect on the sound.
I booted the DVD Live on my laptop CQ60-615DX, also a 64-bit machine, and there was no sound. The sound card information obtained from lspci}grep Audio: 00:1b.0 Audio device Intel Corporation 82801I (ICH9 Family) HD Audio controller (rev 03). I was able to restore audio as described for the other cases. Maybe the problem lies in the 64-bit lucid version. Next time I will burn a non-64 bit Live CD and see what happens.