pm-utils-1.4.1
Introduction to Power Management Utilities
The Power Management Utilities provide
simple shell command line tools to suspend and hibernate the computer.
They can be used to run user supplied scripts on suspend and resume.
This package is known to build and work properly
using an LFS 11.3 platform.
Package Information
Power Management Utilities Dependencies
Optional
xmlto-0.0.28 (to generate man pages)
Optional (runtime)
Hdparm-9.65,
Wireless Tools-29,
ethtool, and
vbetool
User Notes:
https://wiki.linuxfromscratch.org/blfs/wiki/pm-utils
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/<swap_partition> 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.
Installation of Power Management Utilities
Install Power Management Utilities by
running the following commands:
./configure --prefix=/usr \
--sysconfdir=/etc \
--docdir=/usr/share/doc/pm-utils-1.4.1 &&
make
This package does not come with a test suite.
Now, as the root user:
make install
If you don't have xmlto-0.0.28 installed, copy pregenerated
man pages, as the root user:
install -v -m644 man/*.1 /usr/share/man/man1 &&
install -v -m644 man/*.8 /usr/share/man/man8 &&
ln -sv pm-action.8 /usr/share/man/man8/pm-suspend.8 &&
ln -sv pm-action.8 /usr/share/man/man8/pm-hibernate.8 &&
ln -sv pm-action.8 /usr/share/man/man8/pm-suspend-hybrid.8
Configuring Power Management Utilities
Suspend or resume functionality can be easily modified by installing files
into the /etc/pm/sleep.d directory.
These files, known as hooks, are run when the system is put into a sleep
state or resumed. Default hooks are located in /usr/lib/pm-utils/sleep.d, and user hooks
should be put in /etc/pm/sleep.d.
See the pm-action(8) man page for more information.
In order to use hibernation with GRUB and a
swap partition, you need to add kernel parameter
resume=swap_partition (e.g.
resume=/dev/sda1) to the kernel line in the
/boot/grub/grub.cfg configuration file.
Contents
Installed Programs:
on_ac_power, pm-hibernate, pm-is-supported, pm-powersave, pm-suspend
and pm-suspend-hybrid
Installed Libraries:
None
Installed Directories:
/etc/pm, /usr/lib/pm-utils and
/usr/share/doc/pm-utils-1.4.1
Short Descriptions
on_ac_power |
is a script that determines whether the system is running on AC
power (rather than a battery)
|
pm-hibernate |
is a symlink to pm-action script that puts the computer into
hibernate mode (the system is fully powered off and system state is
saved to disk)
|
pm-is-supported |
is a script that checks whether power management features such as
suspend and hibernate are supported
|
pm-powersave |
is a script that puts the computer into powersaving (low power)
mode
|
pm-suspend |
is a symlink to pm-action script that puts the computer into suspend
mode (most devices are shut down and system state is saved in RAM)
|
pm-suspend-hybrid |
is a symlink to pm-action script that puts the computer into
hybrid-suspend mode (the system does everything it needs to
hibernate, but suspends instead of shutting down)
|