Troubleshooting:
1) Is there a difference between suspending by lid-close or by selecting 
Suspend from the shutdown menu?
2) Try disabling Desktop Effects and recreating.
3) Try removing your xorg.conf and recreating. "sudo mv /etc/X11/xorg.conf 
/etc/X11/xorg.conf.bak". If you need to restore it, run "sudo mv 
/etc/X11/xorg.conf.bak /etc/X11/xorg.conf". If for some reason you don't get a 
desktop without xorg.conf, you can boot into recovery mode and select "root" to 
get a command line, and then run the restore commands.
4) Try reproducing on the current mainline kernel [1]. Download and install the 
_all headers, amd64 headers, and amd64 image. You can revert by holding down 
Shift during boot and selecting the 32-22 kernel and then removing the three 
packages in Synaptic (search 2.6.34).

[1]: http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.34-lucid/

-- 
[gm45] Resume failure in Toshiba Satellite U400 (Backtrace included)
https://bugs.launchpad.net/bugs/587136
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