Comment 25 for bug 598664

Adding 'nohpet' to Grub allows resume to work correctly.

I edited /etc/default/grub to add 'nohpet' to GRUB_CMDLINE_LINUX_DEFAULT and then ran 'sudo update-grub' and rebooted. So my GRUB_CMDLINE_LINUX_DEFAULT line now reads:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nohpet"