Suspend suddenly stopped working

I'm running Ubuntu 11.10, and it appears the suspend feature suddenly stopped working. Now, when I close the laptop lid, the machines powers off. To my knowledge, I haven't made any configuration changes to suspend when laptop lid is closed. It was working perfectly yesterday. What can I do to diagnose and hopefully fix this issue?

Adding GRUB_CMDLINE_LINUX="acpi_sleep=nonvs" to /etc/default/grub and then running sudo update-grub seemed to fix the problem.

If that didn't work for you, please refer to the last comment I made on this post for help: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/989674?comments=all