admin-guide/laptops/laptop-mode.rst

2 How to conserve battery power using laptop-mode
14 Laptop mode is used to minimize the time that the hard disk needs to be spun up,
33 To use laptop mode, you don't need to set any kernel configuration options
35 laptop mode will automatically be started when you're on battery. For
40 To configure laptop mode, you need to edit the configuration file, which is
41 located in /etc/default/laptop-mode on Debian-based systems, or in
42 /etc/sysconfig/laptop-mode on other systems.
44 Unfortunately, automatic enabling of laptop mode does not work for
45 laptops that don't have ACPI. On those laptops, you need to start laptop
46 mode manually. To start laptop mode, run "laptop_mode start", and to
47 stop it, run "laptop_mode stop". (Note: The laptop mode tools package now
54 * The downside of laptop mode is that you have a chance of losing up to 10
56   scripts automatically turn off laptop mode when the battery almost runs out,
82 Laptop mode is controlled by the knob /proc/sys/vm/laptop_mode. This knob is
83 present for all kernels that have the laptop mode patch, regardless of any
91 0 disables laptop mode.
108 The laptop mode configuration file is located in /etc/default/laptop-mode on
109 Debian-based systems, or in /etc/sysconfig/laptop-mode on other systems. It
116 amount of work if your battery fails while you're in laptop mode.
120 Automatically disable laptop mode if the remaining number of minutes of
125 The idle timeout that should be set on your hard drive when laptop mode
133 The devices for which the spindown timeout should be adjusted by laptop mode.
138 Disk readahead, in 512-byte sectors, while laptop mode is active. A large
158 before a writeback is forced, while laptop mode is active. Corresponds to
169 when laptop mode is active and when it isn't. When laptop mode is inactive,
171 start taking place. When laptop mode is active, however, background writeouts
177 Enable CPU frequency scaling when in laptop mode. (Requires CPUFreq to be setup.
201   might be useful to the Laptop Mode patch or its users."
204   file after every logging. When you're using laptop-mode and your disk doesn't
207 * Richard Atterer observed that laptop mode does not work well with noflushd
208   (http://noflushd.sourceforge.net/), it seems that noflushd prevents laptop-mode
224 It should be installed as /etc/default/laptop-mode on Debian, and as
225 /etc/sysconfig/laptop-mode on Red Hat, SUSE, Mandrake, and other work-alikes.
231   # amount of work if your battery fails you while in laptop mode.
234   # Automatically disable laptop mode when the number of minutes of battery
316   # ac gets connected/disconnected from a laptop
332   if [ -f /etc/default/laptop-mode ] ; then
334 	. /etc/default/laptop-mode
335   elif [ -f /etc/sysconfig/laptop-mode ] ; then
337           . /etc/sysconfig/laptop-mode
345   # amount of work if your battery fails you while in laptop mode.
547 			# laptop mode is enabled.
551 			# (A couple of early 2.6 laptop mode patches had these.)
691 automatically disables laptop mode when the battery is low was
728   # Automatically disable laptop mode when the battery almost runs out.
740           if [ -f /etc/default/laptop-mode ] ; then
742                   . /etc/default/laptop-mode
743           elif [ -f /etc/sysconfig/laptop-mode ] ; then
745                   . /etc/sysconfig/laptop-mode
760 …logger -p daemon.warning "You are using laptop mode and your battery interface $BATT_INFO is missi…
770 spends spun up/down.  See tools/laptop/dslm/dslm.c