The hibernation mode seen in the leaked Desire HD ROM is popping up in numerous videos featuring hacked HTC gadgets, and the CyanogenMod team has brought the feature to CM6, which has got to be the most popular cooked ROM out there.
Rebooting a device with this feature will cause a complete shutdown and, you guessed it, restart. However, selecting “Power Off” from the menu that pops up when you press the power button sends the phone into a sleep state. Pressing the power button again wakes the device up quickly…very quickly! Check it out:
Via Android Central