ACPI Madness, Suspend Insanity
Having problems putting Ubuntu to sleep or (my case) waking it up again? Check out μswsusp, a killer user-mode suspend/resume utility. It eschews the trouble-fraught kernel ACPI code in favor of a simpler approach: halting the system and saving its state by streaming /dev/snapshot to disk. Magic!
Instructions for integrating it into Ubuntu available courtesy of Paul Betts’ blog