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