Provided by: laptop-mode-tools_1.74-1.1_all 
NAME
/etc/laptop-mode/laptop-mode.conf - Configuration file for laptop-mode-tools.
DESCRIPTION
This manual page documents the options that can be set in the /etc/laptop-mode/laptop-mode.conf
configuration file and in the modular configuration files in the /etc/laptop-mode/conf.d directory. For a
description of what laptop mode does, see the laptop_mode(8) manual page.
SETTINGS
The syntax of options is OPTION=value. There are some groups of options that specify values depending on
power state and laptop mode is enabled. These use the prefix "LM_" to indicate that a value is used only
when laptop mode is enabled, "NOLM_" to indicate the opposite, "AC_" to indicate that a value is used
only when the system is running on AC power, and "BATT_" to indicate that a value is used only when the
system is running on batteries. Settings are prefixed with a combination of an optional LM_/NOLM_ prefix
and an optional AC_/BATT_. For instance, the combination LM_AC_ means "when the system is in laptop mode
and on AC power". (Note that this situation happens only if ENABLE_LAPTOP_MODE_ALWAYS is enabled!) If one
of the prefixes (either LM_/NOLM_ or AC_/BATT_) is missing, then the value is used independently of the
state of laptop mode or AC power, respectively. Options that start with "CONTROL_" are boolean settings
that determine whether laptop mode tools is allowed to control a certain aspect of your system. Boolean
settings always expect "0" to indicate the false (negative/no/disabled) value, and "1" to indicate the
true (positive/yes/enabled) value.
The following sections list the settings that are available in laptop-mode.conf and in the modular
configuration files.
Note: Many settings were moved from the main configuration file to the modular configuration files. The
settings here are split out by modular configuration file, but in installations upgraded from version
1.36 or earlier they may appear in both. In such cases, the configuration settings in the main
configuration file override those in the modular configuration files. To avoid confusion, it is advised
to move the settings from the main configuration files to the modular configuration files when this
situation is detected.
/etc/laptop-mode/conf.d/board-specific/
The board-specific settings framework is for users and distributors who would like to ship their local
customized settings on top of the default settings shipped upstream.
Add local customized settings under this folder to override the system defaults.
/etc/laptop-mode/laptop-mode.conf
This is the main configuration file. It contains the settings for enabling and disabling, plus the core
features: the Linux kernel laptop mode feature and related settings.
ENABLE_LAPTOP_MODE_TOOLS
This module determines if laptop-mode-tools should be run or not. Default is 1 Set it to 0 if
you would like to completely disable laptop-mode-tools
VERBOSE_OUTPUT
Set this to 1 if you want to see a lot of output when you start/stop laptop mode, and to 0 if
you don't want this. Useful for debugging purposes.
LOG_TO_SYSLOG
Set this to 1 if you want to log messages to syslog when you start/stop laptop mode, and to 0
if you don't want this. Useful for debugging purposes.
DEBUG Set this to 1 if you would like to execute the entire laptop-mode program in debug mode.
WARNING: This will create a lot of text output. If you are debugging an individual module,
perhaps you would want to enable each module specific debug mode (available in module conf
files)
ENABLE_AUTO_MODULES
Set this to 1 to enable all laptop mode tools modules that are termed safe to be enabled and
are marked auto. With this option alone, you can enable all auto modules. In case you need to
fine-control the behavior of individual modules, you can modify them accordingly. Default is 1
ENABLE_LAPTOP_MODE_ON_BATTERY
ENABLE_LAPTOP_MODE_ON_AC
These options determine whether laptop mode will be activated when the computer is on battery
or on AC power, respectively. Note that if the system service laptop-mode is not started, then
laptop mode will never be started, even if this option is enabled.
The ENABLE_LAPTOP_MODE_ON_AC setting is useful when you want to run on a headless machine, in
low-power mode, for eg. a Jukebox.
ENABLE_LAPTOP_MODE_WHEN_LID_CLOSED
When this option is enabled, laptop mode will be activated when the laptop's lid is closed,
even if the system is not working on batteries. Note that if the system service laptop-mode is
not started, then laptop mode will never be started, even if this option is enabled. This
feature is only supported on ACPI.
MINIMUM_BATTERY_CHARGE_PERCENT
The minimum number of battery minutes, charge (in mAh) or charge (in mWh) that you want to have
available while your laptop is in laptop mode. When the number of minutes/mAhs/mWhs goes below
this value, the data loss sensitive features are automatically disabled. Note that some
batteries do not report a discharge rate, which means that MINIMUM_BATTERY_MINUTES has no
effect for these batteries. These options are only supported on ACPI.
DISABLE_LAPTOP_MODE_ON_CRITICAL_BATTERY_LEVEL
If this option is enabled, the data loss sensitive features of laptop mode are disabled when
the battery reports its state as "critical". This option is only supported on ACPI.
DISABLE_BATTERY_ALARM_CHECK
If this option is enabled, the alarm values are ignored from the battery. This is helpful if
you have a broken battery which is reporting false alarms.
HD The hard drives which laptop mode should operate upon. If you have multiple hard drives, you
should list them all in this option, separated by spaces, for example: "/dev/hda /dev/hdb".
PARTITIONS
This option specifies the partitions or mount points that laptop mode should operate upon.
Separate the partitions or mount points by spaces. You can include the entry "auto" to stand
for the partitions on the hard drives specified in the HD option.
LM_BATT_MAX_LOST_WORK_SECONDS
LM_AC_MAX_LOST_WORK_SECONDS
The maximum number of seconds worth of data that you can lose when power runs out or when the
computer crashes. This is the maximum number of seconds that laptop mode will keep modified
data in memory without being written to disk. (Note that the NOLM value is missing: modifying
this value when laptop mode is disabled is extremely useless, as it won't save you any power,
and will only lose you work.)
CONTROL_READAHEAD
When this option is enabled, laptop mode tools controls the readahead on the filesystems it
works upon.
LM_READAHEAD
NOLM_READAHEAD
The number of kilobytes to "read ahead" on your hard disks. Reading ahead means that whenever
some data is read from disk, the data which is most likely to be accessed next is read as well,
ahead of time. This then saves a hard disk spinup when the data is actually needed, because the
data is then already in memory. Don't set this value too high, because the readahead applies to
all files that are read!
CONTROL_NOATIME
When this option is enabled, laptop mode tools places the "noatime" option in the mount options
of your filesystems when laptop mode is active. This option has the effect of disabling access
time logging on files, which may save some disk activity. If you use programs that depend on
access times (e.g., mutt), then you should disable this option, or enable the USE_RELATIME
option.
USE_RELATIME
When this option is enabled together with the CONTROL_NOATIME option, laptop mode tools will
use the relatime option instead of the noatime option. This option works for more applications,
and still causes relatively low levels of disk writes. Note that this functionality is only
available in recent kernel versions, and laptop mode tools will ignore this setting for kernels
before 2.6.23.
CONTROL_HD_IDLE_TIMEOUT
When this option is enabled, laptop mode tools adjusts your hard drives' idle timeouts, i.e.,
the time of inactivity before they spin down.
LM_AC_HD_IDLE_TIMEOUT_SECONDS
LM_BATT_HD_IDLE_TIMEOUT_SECONDS
NOLM_HD_IDLE_TIMEOUT_SECONDS
These settings control the idle timeout for your hard drives. The values are specified in
seconds. Values up to 20 minutes can be represented accurately by the hardware, anything above
that is rounded down to half-hour precision. Use the value 0 to disable idle timeout.
CONTROL_HD_POWERMGMT
When this option is enabled, laptop mode tools adjusts your hard drives' power management
settings.
BATT_HD_POWERMGMT
LM_AC_HD_POWERMGMT
NOLM_AC_HD_POWERMGMT
These values specify the power management level for your hard drives. The legal values for
these options can be found in the hdparm(8) manual page, in the documentation of the -B option.
CONTROL_HD_WRITECACHE
When this option is enabled, laptop mode tools controls your hard drives' write cache settings.
NOLM_AC_HD_WRITECACHE
NOLM_BATT_HD_WRITECACHE
LM_HD_WRITECACHE
These options specify whether the write caches should be enabled for your hard drives.
CONTROL_SYSLOG_CONF (deprecated)
When this option is enabled, laptop mode tools controls /etc/syslog.conf as a symlink. This
option is deprecated. Use the configuration-file-control module instead, which is configured in
the /etc/laptop-mode/conf.d/configuration-file-control.conf module configuration file.
Advanced laptop-mode.conf options
These options normally do not need to be modified from their default values. Do not tweak these settings
unless you know what you are doing.
ASSUME_SCSI_IS_SATA
This option, enabled by default, tells laptop mode tools to assume that a device /dev/sdX is a
SATA device, and that it should be controlled using hdparm. If your /dev/sdX drives are really
SCSI drives, disable this option.
ACPI_WITHOUT_AC_EVENTS
Enable this option if you have a laptop with a buggy ACPI implementation that doesn't send out
AC adapter events. Enabling this option will make laptop mode check the AC adapter state
whenever the battery state changes, which achieves just about the same effect as responding to
AC adapter events.
CONTROL_MOUNT_OPTIONS
When this option is enabled, laptop mode tools is allowed to control the mount options for your
filesystems. Disabling this will break CONTROL_NOATIME, but it will most probably also break
laptop mode itself, as changes to the mount options are crucial for achieving spun-down hard
drives.
LM_DIRTY_RATIO
NOLM_DIRTY_RATIO
This option specifies the percentage of system memory that is allowed to contain unwritten
modified data when laptop mode is active.
LM_DIRTY_BACKGROUND_RATIO
NOLM_DIRTY_BACKGROUND_RATIO
This option specifies the percentage of system memory that is allowed to contain unwritten
modified data after the DIRTY_RATIO barrier has been crossed. The effect of this option is
that when more than DIRTY_RATIO percent of memory contains modified data, the system will
synchronously write back data until only DIRTY_BACKGROUND_RATIO percent of memory contains
modified data.
DEF_UPDATE
DEF_XFS_AGE_BUFFER
DEF_XFS_SYNC_INTERVAL
DEF_XFS_BUFD_INTERVAL
DEF_MAX_AGE
These options contain the default (non-laptop-mode) values for some kernel options that are
modified when laptop mode is active. You do not normally need to change these, they represent
the normal kernel defaults.
XFS_HZ This option specifies the number of units in a second that is utilized by a 2.4 kernel. If you
run a 2.4 kernel with an XFS filesystem on non-Intel hardware, you need to change this option
to reflect the kernel "ticks per second" value, which is the kernel variable HZ. Unfortunately
this is not exposed anywhere, so you'll have to specify it manually.
LM_SECONDS_BEFORE_SYNC
The number of seconds that laptop mode waits after the disk goes idle before it starts a full
sync. This should always be less than your hard disk idle timeout, because otherwise you'll
have a sync directly after your drive spins down. Two seconds is usually a good value for this
option.
XFS_HZ This option expresses the unit of the XFS tuning parameters. The default is 100. This option is
only useful for 2.4 kernels that have a value for HZ that is not 100. In the 2.6 kernel series,
the XFS interfaces were modified to always use USER_HZ (which is currently always 100), so for
these kernels you do not need to modify this value. Also, on 2.4 kernels the value of HZ is 100
for the most common architectures, so you need only change this value if you use a less common
architecture.
/etc/laptop-mode/conf.d/ethernet.conf
The ethernet module allows you to control the behavior of your ethernet devices during AC and battery
states.
CONTROL_ETHERNET
Enable this to control various aspects of power savings in the ethernet devices.
BATT_THROTTLE_ETHERNET=1
LM_AC_THROTTLE_ETHERNET=0
NOLM_AC_THROTTLE_ETHERNET=0
These options specify the power states in which you would like to control the ethernet device
THROTTLE_SPEED
Here, you can specify the throttling speed for your ethernet device. The default is "slowest".
Valid values are "slowest", "fastest" or the speed of your ethernet device, like 1000. To know
the exact speed of your ethernet device, you can use the ethtool tool.
DISABLE_WAKEUP_ON_LAN
This setting controls the option to enable/disable the WoL (Wake On LAN) feature. It
permanently disables the WOL feature on the ethernet device. Default is 1. Set it to 0 to
enable the WOL feature.
ETHERNET_DEVICES
Specify the list of ethernet devices to control. Defaults to eth0
DISABLE_ETHERNET_ON_BATTERY
Set this to 1 if you want to completely disable your ethernet device when running on battery,
and when no carrier is detected on the interface (e.g., no active cable is plugged in). Default
is 0
/etc/laptop-mode/conf.d/cpuhotplug.conf
The cpuhotplug module allows you to switch off the CPU cores when running on battery
CONTROL_CPU_HOTPLUG
When this option is enabled, Laptop Mode Tools can hotplug your CPU, thus switching it offline,
and conserving some power. NOTE: This module is NOT enabled by default
/etc/laptop-mode/conf.d/cpufreq.conf
The cpufreq module allows you to control the Linux kernel's CPU frequency scaling settings.
CONTROL_CPU_FREQUENCY
When this option is enabled, laptop mode tools controls your CPU's frequency scaling bounds and
the scaling governor. This option is currently only supported on 2.6 kernels.
BATT_CPU_MAXFREQ
BATT_CPU_INFREQ
BATT_CPU_GOVERNOR
BATT_CPU_IGNORE_NICE_LOAD
LM_AC_CPU_MAXFREQ
LM_AC_CPU_MINFREQ
LM_AC_CPU_GOVERNOR
LM_AC_CPU_IGNORE_NICE_LOAD
NOLM_AC_CPU_MAXFREQ
NOLM_AC_CPU_MINFREQ
NOLM_AC_CPU_GOVERNOR
NOLM_AC_CPU_IGNORE_NICE_LOAD
These options specify the CPU frequency bounds and scaling governor in the various power
states. You can change the MAXFREQ and MINFREQ values to any value listed in
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies.
In addition, you can use "fastest" and "slowest". The GOVERNOR option controls the setting for
/sys/devices/system/cpu/cpufreq/scaling_governor. The available options are dependent on the
installed kernel. The most common ones are "conservative", "performance" and "ondemand". The
IGNORE_NICE_LOAD option controls a setting that is available for the "conservative" and
"ondemand" governors. Set this option to 1 if you want the frequency scaling governor to not
increase the CPU frequency for the sake of low-priority ("nice") background processes.
CONTROL_CPU_THROTTLING
When this option is enabled, laptop mode tools controls your CPU's throttling level. It is
only useful if your CPU doesn't support frequency scaling. This option is only supported on
some ACPI hardware.
BATT_CPU_THROTTLING
LM_AC_CPU_THROTTLING
NOLM_AC_CPU_THROTTLING
These options specify the throttling level for the CPU in the various power states. You can
change it to any level listed in /proc/acpi/processor/CPU0/throttling (use only the number!).
In addition, you can use "maximum" (which is the slowest option), "minimum" (full speed) and
"medium" (about halfway).
/etc/laptop-mode/conf.d/sched-smt-power-savings.conf
The sched-smt-power-savings module controls the behavior of the process scheduler on SMT boxes, when
running in battery mode.
CONTROL_SCHED_SMT_POWER_SAVINGS
Set this to 1 to enable power savings in the process scheduler for SMT processors.
/etc/laptop-mode/conf.d/dpms-standby.conf
The dpms-standby module allows you to control the DPMS standby timeouts for X displays.
CONTROL_DPMS_STANDBY
When this option is enabled, laptop mode will control the DPMS standby timeout for all X
displays on the machine that users have logged on to. In short, this allows laptop mode to
control the time after which your screen is blanked.
There is one limitation to this feature: the settings are not automatically applied to new X
logons. This can be fixed by configuring the display manager. For the gdm display manager,
configure a PostLogin directory (usually /etc/gdm/PostLogin or /etc/X11/gdm/PostLogin), and in
that directory create a shell script called Default. In that file, include the command:
( sleep 60 ; /usr/sbin/laptop_mode force ) &
Similar configurations are possible for other window managers. Please consult your window
manager documentation for more information.
BATT_DPMS_STANDBY
LM_AC_DPMS_STANDBY
NOLM_AC_DPMS_STANDBY
These options specify the display standby timeouts for the X displays, in seconds.
/etc/laptop-mode/conf.d/terminal-blanking.conf
The terminal-blanking module allows you to control the terminal blanking timeouts for the Linux text
console.
CONTROL_TERMINAL
When this option is enabled, laptop mode will control the terminal blanking settings for
Linux's virtual consoles.
TERMINALS This option should contain a space-separated list of console device files that should be
affected by the terminal blanking settings. Only one console device file needs to be included,
because the settings are shared between all virtual consoles. By default this setting is set to
/dev/tty1.
BATT_TERMINAL_BLANK_MINUTES
LM_AC_TERMINAL_BLANK_MINUTES
NOLM_AC_TERMINAL_BLANK_MINUTES
BATT_TERMINAL_POWERDOWN_MINUTES
LM_AC_TERMINAL_POWERDOWN_MINUTES
NOLM_AC_TERMINAL_POWERDOWN_MINUTES
These options specify the terminal blanking and powerdown timeouts, in minutes. The allowed
ranges are 1-60 minutes, or 0 to disable blanking or powerdown. The values are cumulative: the
powerdown value is counted from the moment of screen blanking, not from the start of
inactivity.
/etc/laptop-mode/conf.d/lcd-brightness.conf
The lcd-brightness module allows you to control the brightness of your LCD screen.
CONTROL_BRIGHTNESS
When this option is enabled, laptop mode will adjust your LCD screen's brightness settings, if
possible. You must configure the following settings for this to work.
BATT_BRIGHTNESS_COMMAND
LM_AC_BRIGHTNESS_COMMAND
NOLM_AC_BRIGHTNESS_COMMAND
BRIGHTNESS_OUTPUT
The BRIGHTNESS_COMMAND settings specify commands that should be executed in order to set the
brightness of your LCD. The BRIGHTNESS_OUTPUT setting specifies where the output of the command
will be written. For instance, if your LCD's brightness is adjusted by writing a numeric value
3 to a file called /proc/brightness, you should set the command to "echo 3" and the output file
to "/proc/brightness". If your LCD's brightness is adjusted using a utility like "toshset", you
should include the entire toshset command line as the command, and set the output file to
"/dev/null".
/etc/laptop-mode/conf.d/kbd-backlight.conf
The kbd-backlight module allows you to control the brightness of your LCD screen.
CONTROL_KBDLIGHT
When this option is enabled, laptop mode will adjust your keyboard backlight brightness
settings, if possible. You must configure the following settings for this to work.
BATT_KBDLIGHT_COMMAND
LM_AC_KBDLIGHT_COMMAND
NOLM_AC_KBDLIGHT_COMMAND
KBD_BRIGHTNESS_OUTPUT
The KBDLIGHT_COMMAND settings specify commands that should be executed in order to set the
brightness of your keyboard backlight. The KBD_BRIGHTNESS_OUTPUT setting specifies where the
output of the command will be written. For instance, if your keyboard's backlight brightness is
adjusted by writing a numeric value 3 to a file called /proc/brightness, you should set the
command to "echo 3" and the output file to "/proc/brightness". If your LCD's brightness is
adjusted using a utility like "toshset", you should include the entire toshset command line as
the command, and set the output file to "/dev/null".
CONTROL_VGASWITCHEROO
When this option is enabled, laptop mode will use the vgaswitcheroo interface to disable the
unused hybrid graphics card. For this module to work, you need to ensure you have debugfs
enabled/mounted
BATT_ENABLE_VGASWITCHEROO
LM_AC_ENABLE_VGASWITCHEROO
NOLM_AC_ENABLE_VGASWITCHEROO
VGASWITCHEROO_FILE
The above settings specify under what modes should vgaswitcheroo interface be used to
enable/disable hybrid graphics. The VGASWITCHEROO_FILE setting specifies the vgaswitcheroo
interface to talk to the Linux kernel for hybrid graphics power savings
/etc/laptop-mode/conf.d/auto-hibernate.conf
The auto-hibernate module allows you to automatically hibernate your computer when the battery goes
critical or when the battery level goes below a certain threshold.
ENABLE_AUTO_HIBERNATION
When this option is enabled, laptop mode will automatically hibernate your computer when the
battery level reaches a certain configurable threshold. This feature is only available when
ACPI is enabled.
HIBERNATE_COMMAND
This option specifies the command that laptop mode should execute when auto-hibernation is
triggered. Normally, this is set to something like "/usr/sbin/hibernate".
AUTO_HIBERNATION_BATTERY_CHARGE_PERCENT
The battery level threshold for auto-hibernation, as a percentage of total battery design
capacity.
AUTO_HIBERNATION_ON_CRITICAL_BATTERY_LEVEL
When this option is enabled, auto-hibernation will kick in when the battery reports its state
as "critical".
/etc/laptop-mode/conf.d/battery-level-polling.conf
Some battery hardware does not send out proper level change events, or too infrequent ones. For such
hardware, laptop mode tools will not detect that the battery has reached a critical level. The battery-
level-polling module allows you to use the auto-hibernate module and the other battery level dependent
features of laptop mode tools even when your battery does not send out frequent ACPI to indicate a change
in level.
CONTROL_BATTERY_LEVEL_POLLING
When this option is enabled, laptop mode tools will automatically poll the battery level every
once in a while to see if the levels have changed, and to see if actions should be taken as a
consequence.
/etc/laptop-mode/conf.d/start-stop-programs.conf
The start-stop-programs module allows you to start or stop programs when the computer switches to a
different power state.
CONTROL_START_STOP
If this option is enabled, laptop mode tools will automatically start and stop daemons or other
programs for you. The actual configuration of which daemons are to be stopped/started is done
by placing links to the daemons' init scripts in the following directories:
/etc/laptop-mode/batt-start
/etc/laptop-mode/batt-stop
/etc/laptop-mode/lm-ac-start
/etc/laptop-mode/lm-ac-stop
/etc/laptop-mode/nolm-ac-start
/etc/laptop-mode/nolm-ac-stop
As you have probably guessed, the directories of the form "X-stop-daemons" should contain init
scripts of daemons that you want stopped in mode X, while the directories of the form "X-start-
daemons" should contain init scripts of daemons that you want started in mode X. Of course, it
is possible to put in your own handling of modes as well: the only requirement on the scripts
in the directories is that they handle the "start" and "stop" commands, like init scripts
usually do.
The ordering of the script handling is as follows. When a mode is entered, the actions of the
previous mode are undone, in reverse order. This means that if the previous mode had done
"daemon1 stop", "daemon2 stop" and "daemon3 start", then the undoing actions will be "daemon3
stop", "daemon2 start", "daemon1 start". After that, the stop-scripts for the new mode are
called, and then the start-scripts are called. Please note that there is no detection of
commonalities between modes at this point, i.e., if the mode you're coming from and the mode
you're going to both specify that a daemon "X" should be stopped, then the daemon will be un-
stopped (that is, started) while leaving the previous mode, and then stopped again.
BATT_STOP
BATT_START
LM_AC_STOP
LM_AC_START
NOLM_AC_STOP
NOLM_AC_START
These options allow you to stop services (through their init scripts) in certain power states.
Specify a space-separated list of service names in these options. These services are
started/stopped together with the files from the directories mentioned above.
/etc/laptop-mode/conf.d/ac97-powersave.conf
The ac97-powersave module allows you to enable the Intel AC97 integrated audio power saving mode.
CONTROL_AC97_POWER
If this option is enabled, laptop mode tools will automatically enable the AC97 power saving
settings. The power saving settings are always enabled, not only on battery power. Note: On
some machines it has been reported that the AC97 power savings triggers the annoying click
sound during power state transitions
/etc/laptop-mode/conf.d/nmi-watchdog.conf
The nmi-watchdog module allows you to enable the NMI Watchdog timer power savings. Enabling this module
lowers down one hw-pmu counter.
CONTROL_NMI_WATCHDOG
If this option is enabled, laptop mode tools will automatically disable the NMI Watchdog timer
when on battery. This module is part of auto modules. Thus enabling auto modules setting will
activate this module automatically.
/etc/laptop-mode/conf.d/nouveau.conf
The nouveau module allows you to enable the power savings for nvidia cards with the nouveau device
driver. Enabling this module should lower down power consumption.
CONTROL_NOUVEAU
If this option is enabled, laptop mode tools will automatically apply the power savings values
when on battery. This module is part of auto modules. Thus enabling auto modules setting will
activate this module automatically.
Please ensure that your nvidia card's power saving functionality are available through the
nouveau driver. Also ensure to set the correct path for your device in
"/sys/kernel/debug/dri/N/pstate" where N is the number enumerated for the device
/etc/laptop-mode/conf.d/pci-aspm.conf
The pcie-aspm module allows you to enable the PCI Express (PCIe) Active State Power Management (ASPM).
CONTROL_PCI_ASPM
If this option is enabled, laptop mode tools will enable PCI ASPM powersave mode when on
battery. This module is part of auto modules. Thus enabling auto modules setting will activate
this module automatically. PCIe ASPM may require that the pcie_aspm=force kernel option is
enabled.
/etc/laptop-mode/conf.d/usb-autosuspend.conf
This option has been superseded by the new runtime-pm.conf settings
/etc/laptop-mode/conf.d/runtime-pm.conf
The runtime-pm module allows you to enable the Runtime Power Management framework for the Linux kernel.
CONTROL_RUNTIME_AUTOSUSPEND
If this option is enabled, laptop mode tools will automatically enable the USB autosuspend
feature for all devices. The USB autosuspend feature will always be enabled, not only on
battery power.
AUTOSUSPEND_RUNTIME_DEVID_BLACKLIST
Here, you can specify the list of USB IDs that should not use autosuspend. Use lsusb to find
out the IDs of your USB devices. Example: AUTOSUSPEND_RUNTIME_DEVID_BLACKLIST="046d:c025
0123:abcd"
AUTOSUSPEND_RUNTIME_DEVTYPE_BLACKLIST
Here, you can specify the list of device driver that should not use autosuspend. The driver
type is given by "DRIVER=..." in a device's uevent file Example:
AUTOSUSPEND_RUNTIME_DEVTYPE_BLACKLIST="usbhid usb-storage usbmouse"
AUTOSUSPEND_USE_WHITELIST
Set this to use opt-in/whitelist instead of opt-out/blacklist for deciding which devices should
be autosuspended. AUTOSUSPEND_USE_WHITELIST=0 means AUTOSUSPEND_*_BLACKLIST will be used.
AUTOSUSPEND_USE_WHITELIST=1 means AUTOSUSPEND_*_WHITELIST will be used.
AUTOSUSPEND_RUNTIME_DEVID_WHITELIST
The list of Device IDs that should use autosuspend. Use system commands or look into sysfs to
find out the IDs of your devices. Example: AUTOSUSPEND_DEVID_WHITELIST="046d:c025 0123:abcd"
AUTOSUSPEND_RUNTIME_DEVTYPE_WHITELIST
The list of device driver types that should use autosuspend. The driver type is given by
"DRIVER=..." in a device's uevent file. Example: AUTOSUSPEND_DEVTYPE_WHITELIST="usbhid usb-
storage usbmouse"
/etc/laptop-mode/conf.d/intel-hda-powersave.conf
The intel-hda-powersave module allows you to enable the Intel HDA integrated audio power saving mode.
CONTROL_INTEL_HDA_POWER
If this option is enabled, laptop mode tools will automatically enable the Intel HDA power
saving settings. The power saving settings are always enabled, not only on battery power.
/etc/laptop-mode/conf.d/configuration-file-control.conf
The configuration-file-control module allows you to switch between different configuration files when the
computer is in different power states.
The primary use for this feature is for controlling the configuration files of syslog daemons. Syslog
daemons have a tendency to sync their log files when entries are written to them. This causes disks to
spin up, which is not very nice when you're trying to save power. The syslog.conf configuration file can
be tweaked so that syslogd will not sync a given file, by prepending the log file name with a dash, like
this:
mail.* -/var/log/mail/mail.log
Note: This feature will NOT work if CONTROL_SYSLOG_CONF is set in laptop-mode.conf. To start using this
feature, remove the CONTROL_SYSLOG_CONF section in laptop-mode.conf, and then restart the laptop-mode-
tools service. The new config files have different names than the old ones, and settings are NOT
migrated. You will have to do this manually.
CONTROL_CONFIG_FILES
If this option is enabled, laptop mode tools will use the following options to switch
configuration files depending on the power state.
CONFIG_FILES
This option should contain a space-separated list of configuration files that should be
switched around depending on the power state.
For each configuration file, the specific configuration files will be named as follows:
<conffile>-nolm-ac
<conffile>-lm-ac
<conffile>-batt
The first file will be used when the system is on AC power and laptop mode is not active. The
second file will be used when the system is on AC power and laptop mode is active. The third
file will be used when the system is on battery power.
When the laptop mode tools service is enabled, it will replace the configuration files with a
symlink to one of the three state-based configuration files. The original configuration file
will be saved as <config file>.lmbackup, and it will be restored when the laptop mode tools
service is disabled.
When you add files to this list, make sure to also add the appropriate programs and services to
the configuration settings below.
You can create the alternate configuration files yourself. If you don't, they will be created
by laptop mode tools the next time it is restarted. To force the files to be created, run the
laptop-mode service init script with the "restart" parameter.
CONFIG_FILE_SIGNAL_PROGRAMS
This option should contain a space-separated list of programs that should be signalled after
the config files have been switched around. This only works for programs that respond to the
SIGHUP signal by reloading their configuration files.
CONFIG_FILE_RELOAD_SERVICES
This option should contain a space-separated list of services which should be reloaded after
the config files have been switched around.
/etc/laptop-mode/conf.d/wireless-power.conf
The wireless-power module allows you to alter the power management settings for wireless network adapters
that support the iwconfig "power" option. This module is not usable for Intel network adapters that use
the iwlwifi or ipw drivers, they are supported by separate modules described below.
CONTROL_WIRELESS_POWER_SAVING
If this option is enabled, laptop mode tools will set the wireless power saving mode settings
based on the power state.
WIRELESS_AC_POWER_SAVING
WIRELESS_BATT_POWER_SAVING
These settings define the power saving modes on AC and on battery. The allowed values are 0 (to
disable power saving mode) and 1 (to enable power saving mode).
/etc/laptop-mode/conf.d/wireless-ipw-power.conf
The wireless-ipw-power module allows you to alter the power management settings for Intel PRO/Wireless
3945, 2100 and 2200 wireless network adapters. This module is intended for use with the ipw3945, ipw2100,
ipw2200 drivers, not with the iwlwifi drivers.
CONTROL_IPW_POWER
If this option is enabled, laptop mode tools will set the wireless power management settings
based on the power state.
IPW3945_AC_POWER
IPW3945_BATT_POWER
These settings define the power management levels for the ipw3945 driver. The defaults are 6
for AC, and 7 for battery mode. The allowed values are 1 (highest power) to 5 (lowest power), 6
(AC mode, full power) and 7 (battery mode, lowest power).
IPW2100_AC_POWER
IPW2100_BATT_POWER
These settings define the power management levels for the ipw2100 driver. The defaults are 0
for AC mode and 5 for battery mode.
/etc/laptop-mode/conf.d/wireless-iwl-power.conf
The wireless-iwl-power module allows you to alter the power management settings for Intel PRO/Wireless
3945 and Intel WiFi Link 4965 wireless network adapters. This module is intended for use with the
iwlwifi drivers, not with the old ipw drivers.
CONTROL_IWL_POWER
If this option is enabled, laptop mode tools will set the wireless power management settings
based on the power state.
IWL_AC_POWER
IWL_BATT_POWER
These settings define the power management levels on AC and on battery. The defaults are 0 for
AC, and 3 for battery mode. The allowed values are 0 (highest power) to 5 (lowest power), 6 (AC
mode, full power) and 7 (battery mode, lowest power).
/etc/laptop-mode/conf.d/exec-commands.conf
There can be many odd machines and many power savings settings, that laptop-mode-tools currently does not
cover. If you run into a similar power saving problem, where you do not have a laptop-mode-tools module
for it, you can use the exec-commands module to trigger the command during power state changes. Please do
contribute back the power saving item as a module to the upstream developers.
CONTROL_EXEC_COMMANDS
Set this to 0 to disable execution of custom commands during power state changes. Default is
auto.
BATT_EXEC_COMMAND_0=
BATT_EXEC_COMMAND_1=
LM_AC_EXEC_COMMAND_0=
LM_AC_EXEC_COMMAND_1=
NOLM_AC_EXEC_COMMAND_0=
NOLM_AC_EXEC_COMMAND_1=
Here you can specify your custom command that will need to be executed. The numbers can grow up
to 9. The command needs to be specified in double quotes
/etc/laptop-mode/conf.d/eee-superhe.conf
The eee-superhe module allows you to control the CPU frequency scalling on the EEE PC. It requires the
eeepc_laptop kernel module to be loaded.
CONTROL_SUPERHE
It this option is enabled, laptop mode tools will automatically control the FSB speed on the
EEE PC.
BATT_SUPERHE
LM_AC_SUPERHE
NOLM_AC_SUPERHE
These settings define the power management levels on AC and on battery. The defaults are 0 for
LM_AC and NOLM_AC, and 2 for battery mode.
/etc/laptop-mode/conf.d/hal-polling.conf
The hal-polling module allows you to control the polling of CD/DVD drives by HAL. The polling is needed
for some drives to detect inserted CDs, but it uses a considerable amount of power. Enable this module to
disable the polling, but only if our drive doesn't need it, or if you are willing to mount CDs manually
in exchange for the power saving.
CONTROL_HAL_POLLING
If this option is enabled, laptop mode tools will control the HAL polling behaviour.
BATT_DISABLE_HAL_POLLING
AC_DISABLE_HAL_POLLING
These settings define the polling behaviour on AC and on battery. To disable polling, set the
options to 1, to enable, set them to 0.
HAL_POLLING_DEVICES
This setting defines for which devices the polling behaviour will be altered. It should
contain a space separated list of devices.
/etc/laptop-mode/conf.d/bluetooth.conf
The bluetooth module allows you to enable/disable bluetooth depending on the power state.
CONTROL_BLUETOOTH
If this option is enabled, laptop mode tools will enable/disable bluetooth when the power state
changes.
BATT_ENABLE_BLUETOOTH
AC_ENABLE_BLUETOOTH
These settings define whether bluetooth is enabled on AC and on battery. To disable bluetooth,
set the options to 0, to enable, set them to 1.
BLUETOOTH_INTERFACES
This setting defines the interfaces the bluetooth module will control. It should contain a
space separated list of interfaces. (Note that you probably have only one bluetooth interface,
and it will probably be named "hci0".)
/etc/laptop-mode/conf.d/intel-sata-powermgmt.conf
The intel-sata-powermgmt module allows you to enable the power saving mode for Intel AHCI compliant SATA
controllers. This power saving mode is also known as Aggressive Link Power Management (ALPM).
CONTROL_INTEL_SATA_POWER
If this option is enabled, laptop mode tools will automatically enable the Intel SATA
controller power saving settings. The power saving settings are always enabled, not only on
battery power.
BATT_ACTIVATE_SATA_POWER=1
LM_AC_ACTIVATE_SATA_POWER=0
NOLM_AC_ACTIVATE_SATA_POWER=0
These settings control the behavior of the SATA devices under AC and battery power states
/etc/laptop-mode/conf.d/sched-mc-power-savings.conf
The sched-mc-power-savings module allows you to tune the Linux kernel process scheduler to optimize for
power usage on multi-core and multi-processor computers.
CONTROL_SCHED_MC_POWER_SAVINGS
If this option is enabled, laptop mode tools will automatically configure the kernel process
scheduler to optimize for power usage on multi-core and multi-processor computers. The
optimizations will only be enabled in battery mode.
/etc/laptop-mode/conf.d/video-out.conf
The video-out module allows you to selectively disable video outputs depending on the power status. This
works only for video hardware that supports xrandr.
CONTROL_VIDEO_OUTPUTS
If this option is enabled, laptop mode tools will automatically disable the configured video
outputs.
BATT_DISABLE_VIDEO_OUTPUTS
LM_AC_DISABLE_VIDEO_OUTPUTS
NOLM_AC_DISABLE_VIDEO_OUTPUTS
These settings define which video outputs are to be disabled in which power state. The format
is a space-separated list of outputs. The allowed names of the outputs depend on what the video
hardware supports, they can be found by running the "xrandr" command.
SEE ALSO
laptop_mode(8).
lm-profiler(8).
hdparm(8).
AUTHOR
This manual page was written by Bart Samwel (bart@samwel.tk). Permission is granted to copy, distribute
and/or modify this document under the terms of the GNU General Public License, Version 2 any later
version published by the Free Software Foundation.
LAPTOP-MODE.CONF(8)