README for pm-utils NOTES Read http://crux.nu/Wiki/Pm-utils for usage. Kernel Configuration: If needed, enable the following options in the kernel configuration and recompile the kernel: Power management and ACPI options ---> <*> Suspend to RAM and standby [CONFIG_SUSPEND] <*> Hibernation (aka 'suspend to disk') [CONFIG_HIBERNATION] Suspend to RAM allows the system to enter sleep states in which main memory is powered and thus its contents are preserved. The method cuts power to most parts of the machine aside from the RAM. Because of the large power savings, it is advisable for laptops to automatically enter this mode when the computer is running on batteries and the lid is closed (or the user is inactive for some time). Suspend to disk (Hibernation) saves the machine's state into swap space and completely powers off the machine. When the machine is powered on, the state is restored. Until then, there is zero power consumption. Suspend to RAM and hibernation are normally appropriate for portable devices such as laptops, but can be used on workstations. The capability is not really appropriate for servers. To use hibernation, the kernel parameter resume=/dev/ has to be used on the kernel command line (in grub.cfg). The swap partition should be at least the size of the physical RAM on the system.