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SubscribePower Management References - disk
Hibernation Basics
Linux makes an image from current memory contents and system states using swap space. When user tries to resume, the make-shift image is loaded. As the system states are stored in persistence storage, memory can be powered off completely. This makes hibernation more power-saving than suspend-to-ram. On the other hand, resuming the system from contents in the disk may be slow. Thus resuming in general takes longer time.
Setting up hibernation
Because of its nature, hibernation is much trickier to set up. For example, you'll need a swap partion or swap file for the hibernation image. See See Hibernation in Power management/Suspend and hibernate from Arch Linux wiki.
Behaviors
The behavior of suspension can be obeserved in
dmesgby runingpm-hibernateafter enable the/sys/power/pm_debug_messages. Thepm-hibernateis part of thepm-utilstool. You can install them on Ubuntu by:To enable the
pm_debug_messages, simplycat1 into it:Doing this will enable extra messages regarding power management in the
dmesg.Finally, to start doing hibernation:
Note that the machine hasn't setup swap files properly, so those are not catual hiberanation behaviors. That being said, some notable differences between suspend-to-ram can already be observed. For example, fomr logs you could see kernel trying to create image for hibernation.
Suspension Behavior
Resuming Behavior