For the 8400 GS Nvidia card, try the following workaround:
http://linux.dell.com/wiki/index.php/Ubuntu_7.10/Issues/8400M_Suspend_Hibernate-Failure
For the 8400 GS Nvidia card, try the following workaround:
http:// linux.dell. com/wiki/ index.php/ Ubuntu_ 7.10/Issues/ 8400M_Suspend_ Hibernate- Failure