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.
119 The laptop mode configuration file is located in /etc/default/laptop-mode on
120 Debian-based systems, or in /etc/sysconfig/laptop-mode on other systems. It
127 amount of work if your battery fails while you're in laptop mode.
131 Automatically disable laptop mode if the remaining number of minutes of
136 The idle timeout that should be set on your hard drive when laptop mode
144 The devices for which the spindown timeout should be adjusted by laptop mode.
149 Disk readahead, in 512-byte sectors, while laptop mode is active. A large
169 before a writeback is forced, while laptop mode is active. Corresponds to
180 when laptop mode is active and when it isn't. When laptop mode is inactive,
182 start taking place. When laptop mode is active, however, background writeouts
188 Enable CPU frequency scaling when in laptop mode. (Requires CPUFreq to be setup.
212   might be useful to the Laptop Mode patch or its users."
215   file after every logging. When you're using laptop-mode and your disk doesn't
218 * Richard Atterer observed that laptop mode does not work well with noflushd
219   (http://noflushd.sourceforge.net/), it seems that noflushd prevents laptop-mode
235 It should be installed as /etc/default/laptop-mode on Debian, and as
236 /etc/sysconfig/laptop-mode on Red Hat, SUSE, Mandrake, and other work-alikes.
242   # amount of work if your battery fails you while in laptop mode.
245   # Automatically disable laptop mode when the number of minutes of battery
327   # ac gets connected/disconnected from a laptop
343   if [ -f /etc/default/laptop-mode ] ; then
345 	. /etc/default/laptop-mode
346   elif [ -f /etc/sysconfig/laptop-mode ] ; then
348           . /etc/sysconfig/laptop-mode
356   # amount of work if your battery fails you while in laptop mode.
558 			# laptop mode is enabled.
562 			# (A couple of early 2.6 laptop mode patches had these.)
702 automatically disables laptop mode when the battery is low was
739   # Automatically disable laptop mode when the battery almost runs out.
751           if [ -f /etc/default/laptop-mode ] ; then
753                   . /etc/default/laptop-mode
754           elif [ -f /etc/sysconfig/laptop-mode ] ; then
756                   . /etc/sysconfig/laptop-mode
771 …logger -p daemon.warning "You are using laptop mode and your battery interface $BATT_INFO is missi…
781 spends spun up/down.  See tools/laptop/dslm/dslm.c