No sound on Live Session on aluminium iMac

The above should be AMD64 desktop. Sorry about that.

The same problem occurs with the i386 Live CD. Same hardware, but I've attached the new .xsession-errors file.

Thank you for taking the time to report this bug and helping to make Ubuntu better. Could you please add the output requested in the Reporting Sound Bugs section of https://help.ubuntu.com/community/DebuggingSoundProblems as separate attachments? Thanks in advance.

See bug 147087, where I've attached the files for the full install. I won't have time to retest with a LiveCD before next weekend, if it's still necessary.

The information from the installed system is more useful so I am going to mark this as a duplicate of bug 147087.

Beginning with the Hardy Heron 8.04 development cycle, all open Ubuntu kernel bugs need to be reported against the "linux" kernel package. We are automatically migrating this bug to the new "linux" package. However, development has already began for the upcoming Intrepid Ibex 8.10 release. It would be helpful if you could test the upcoming release and verify if this is still an issue - http://www.ubuntu.com/testing . If the issue still exists, please update this report by changing the Status of the "linux" task from "Incomplete" to "New". We appreciate your patience and understanding as we make this transition. Thanks!