gistfile1.txt

https://help.ubuntu.com/community/MacBookPro11-1/Saucy#Won.27t_stay_suspended

Won't stay suspended

If your laptop wakes up on its own a minute or two after suspending (just long enough for you to put it in your bag where it can wake up and start overheating!) then disable "wake from USB" -- presumably the keyboard, trackpad, or some other internal component is waking up.

To disable "wake from USB":

echo XHC1 | sudo tee /proc/acpi/wakeup

You need to do this after every boot, so add it to an init script or similar.

To confirm that it is disabled:

cat /proc/acpi/wakeup

(You can tell that XHC1 is the USB controller by comparing the PCI slot IDs from cat /proc/acpi/wakeup with the output of lspci).