Comment 33 for bug 29695

Unfortunately, this trace doesn't give me enough information. The pm_trace method is not always 100% effective.

Can you try the daily build which has a recently updated kernel (2.6.20-9)?
http://cdimage.ubuntu.com/daily-live/current/feisty-desktop-i386.iso

Alternatively, you can perform a Feisty update using Synaptic which will pull all recent updates including this kernel.