Same problem with me (dell d505, intel 801 card). 
I have tried to chance several options inside /etc/defaults/acpi-support, as 
discussed in
https://bugs.launchpad.net/ubuntu/+bug/38915/comments/61
No success. So, I decided to test if my system could hibernate from console, 
using /etc/acpi/hibernate.sh from command line. This gave me some freezes as 
well and a clue: acpi and kernel. 
The only think that it is working at this moment: adding acpi=off inside 
menu.lst. 
I can not hybernate anymore but system is working after logout. 
So, problem seems to be related to kernel+acpi+video.
I can help in debugging if someone say me what to do (files, logs, etc).

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System freezes when login out
https://bugs.launchpad.net/bugs/229043
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