Swsusp  swsusp (Software Suspend) is a kernel feature/program which is part of power management framework in the Linux kernel. It is the default suspend framework as of kernel 3.8. SWSUSP helps to drive the system to a low power state (called "suspend") when not actively used while providing the ability to return to the same state as before suspend (called "resume"/"restore"). As of 3.8 Swsusp provides the following options under suspend:   For more details on Swsusp refer to kernel documentation under " Documentation/power/swsusp.txt"  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   You may check other suspend options available by doing"  "cat /sys/power/state"  depending on your kernel config it will show something similar to "[standby] mem disk"  and options available under disk can be viewed by  "cat /sys/power/disk"  depending on your kernel config it will show something similar to "[platform] shutdown reboot"  swsusp lacks compression and graphical progress indication which can be provided through Uswsusp.