Swsusp

Swsusp

swsusp (Software Suspend) is a "suspend-to-disk" implementation in the 2.6 series Linux kernel. It is the Linux equivalent of Windows hibernate functionality. To enable swsusp, the following should be selected during kernel configuration :

Power management options → <*>Power management support (CONFIG_PM) Power management options → <*>Software Suspend (CONFIG_SOFTWARE_SUSPEND) Power management options → [/dev/resume_partition] Default resume partition (CONFIG_PM_STD_PARTITION)

The "/dev/resume_partition" needs to be replaced by the actual swap partition that is to be used for suspending. Otherwise "resume=/dev/resume_partition" can be given as a parameter during system bootup. The actual "suspend" is done by :

echo shutdown > /sys/power/disk; echo disk > /sys/power/state

swsusp lacks some features, such as compression and graphical progress indication. You can still get them, 2.6.18+ kernels allow suspend to be controlled from userspace.

See also

*TuxOnIce
* [http://suspend.sf.net/ muswsusp] userspace software for suspending to ram and/or disk


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