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6.2.7.16 Power management Services

The (gnu services pm) module provides a Guix service definition for the Linux power management tool TLP.

TLP enables various powersaving modes in userspace and kernel. Contrary to upower-service, it is not a passive, monitoring tool, as it will apply custom settings each time a new power source is detected. More information can be found at TLP home page.

Scheme Variable: tlp-service-type

The service type for the TLP tool. Its value should be a valid TLP configuration (see below). To use the default settings, simply write:

(service tlp-service-type)

By default TLP does not need much configuration but most TLP parameters can be tweaked using tlp-configuration.

Each parameter definition is preceded by its type; for example, ‘boolean foo’ indicates that the foo parameter should be specified as a boolean. Types starting with maybe- denote parameters that won’t show up in TLP config file when their value is 'disabled.

Available tlp-configuration fields are:

tlp-configuration parameter: package tlp

The TLP package.

tlp-configuration parameter: boolean tlp-enable?

Set to true if you wish to enable TLP.

Defaults to ‘#t’.

tlp-configuration parameter: string tlp-default-mode

Default mode when no power supply can be detected. Alternatives are AC and BAT.

Defaults to ‘"AC"’.

tlp-configuration parameter: non-negative-integer disk-idle-secs-on-ac

Number of seconds Linux kernel has to wait after the disk goes idle, before syncing on AC.

Defaults to ‘0’.

tlp-configuration parameter: non-negative-integer disk-idle-secs-on-bat

Same as disk-idle-ac but on BAT mode.

Defaults to ‘2’.

tlp-configuration parameter: non-negative-integer max-lost-work-secs-on-ac

Dirty pages flushing periodicity, expressed in seconds.

Defaults to ‘15’.

tlp-configuration parameter: non-negative-integer max-lost-work-secs-on-bat

Same as max-lost-work-secs-on-ac but on BAT mode.

Defaults to ‘60’.

tlp-configuration parameter: maybe-space-separated-string-list cpu-scaling-governor-on-ac

CPU frequency scaling governor on AC mode. With intel_pstate driver, alternatives are powersave and performance. With acpi-cpufreq driver, alternatives are ondemand, powersave, performance and conservative.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-space-separated-string-list cpu-scaling-governor-on-bat

Same as cpu-scaling-governor-on-ac but on BAT mode.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-non-negative-integer cpu-scaling-min-freq-on-ac

Set the min available frequency for the scaling governor on AC.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-non-negative-integer cpu-scaling-max-freq-on-ac

Set the max available frequency for the scaling governor on AC.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-non-negative-integer cpu-scaling-min-freq-on-bat

Set the min available frequency for the scaling governor on BAT.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-non-negative-integer cpu-scaling-max-freq-on-bat

Set the max available frequency for the scaling governor on BAT.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-non-negative-integer cpu-min-perf-on-ac

Limit the min P-state to control the power dissipation of the CPU, in AC mode. Values are stated as a percentage of the available performance.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-non-negative-integer cpu-max-perf-on-ac

Limit the max P-state to control the power dissipation of the CPU, in AC mode. Values are stated as a percentage of the available performance.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-non-negative-integer cpu-min-perf-on-bat

Same as cpu-min-perf-on-ac on BAT mode.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-non-negative-integer cpu-max-perf-on-bat

Same as cpu-max-perf-on-ac on BAT mode.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-boolean cpu-boost-on-ac?

Enable CPU turbo boost feature on AC mode.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-boolean cpu-boost-on-bat?

Same as cpu-boost-on-ac? on BAT mode.

Defaults to ‘disabled’.

tlp-configuration parameter: boolean sched-powersave-on-ac?

Allow Linux kernel to minimize the number of CPU cores/hyper-threads used under light load conditions.

Defaults to ‘#f’.

tlp-configuration parameter: boolean sched-powersave-on-bat?

Same as sched-powersave-on-ac? but on BAT mode.

Defaults to ‘#t’.

tlp-configuration parameter: boolean nmi-watchdog?

Enable Linux kernel NMI watchdog.

Defaults to ‘#f’.

tlp-configuration parameter: maybe-string phc-controls

For Linux kernels with PHC patch applied, change CPU voltages. An example value would be ‘"F:V F:V F:V F:V"’.

Defaults to ‘disabled’.

tlp-configuration parameter: string energy-perf-policy-on-ac

Set CPU performance versus energy saving policy on AC. Alternatives are performance, normal, powersave.

Defaults to ‘"performance"’.

tlp-configuration parameter: string energy-perf-policy-on-bat

Same as energy-perf-policy-ac but on BAT mode.

Defaults to ‘"powersave"’.

tlp-configuration parameter: space-separated-string-list disks-devices

Hard disk devices.

tlp-configuration parameter: space-separated-string-list disk-apm-level-on-ac

Hard disk advanced power management level.

tlp-configuration parameter: space-separated-string-list disk-apm-level-on-bat

Same as disk-apm-bat but on BAT mode.

tlp-configuration parameter: maybe-space-separated-string-list disk-spindown-timeout-on-ac

Hard disk spin down timeout. One value has to be specified for each declared hard disk.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-space-separated-string-list disk-spindown-timeout-on-bat

Same as disk-spindown-timeout-on-ac but on BAT mode.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-space-separated-string-list disk-iosched

Select IO scheduler for disk devices. One value has to be specified for each declared hard disk. Example alternatives are cfq, deadline and noop.

Defaults to ‘disabled’.

tlp-configuration parameter: string sata-linkpwr-on-ac

SATA aggressive link power management (ALPM) level. Alternatives are min_power, medium_power, max_performance.

Defaults to ‘"max_performance"’.

tlp-configuration parameter: string sata-linkpwr-on-bat

Same as sata-linkpwr-ac but on BAT mode.

Defaults to ‘"min_power"’.

tlp-configuration parameter: maybe-string sata-linkpwr-blacklist

Exclude specified SATA host devices for link power management.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-on-off-boolean ahci-runtime-pm-on-ac?

Enable Runtime Power Management for AHCI controller and disks on AC mode.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-on-off-boolean ahci-runtime-pm-on-bat?

Same as ahci-runtime-pm-on-ac on BAT mode.

Defaults to ‘disabled’.

tlp-configuration parameter: non-negative-integer ahci-runtime-pm-timeout

Seconds of inactivity before disk is suspended.

Defaults to ‘15’.

tlp-configuration parameter: string pcie-aspm-on-ac

PCI Express Active State Power Management level. Alternatives are default, performance, powersave.

Defaults to ‘"performance"’.

tlp-configuration parameter: string pcie-aspm-on-bat

Same as pcie-aspm-ac but on BAT mode.

Defaults to ‘"powersave"’.

tlp-configuration parameter: string radeon-power-profile-on-ac

Radeon graphics clock speed level. Alternatives are low, mid, high, auto, default.

Defaults to ‘"high"’.

tlp-configuration parameter: string radeon-power-profile-on-bat

Same as radeon-power-ac but on BAT mode.

Defaults to ‘"low"’.

tlp-configuration parameter: string radeon-dpm-state-on-ac

Radeon dynamic power management method (DPM). Alternatives are battery, performance.

Defaults to ‘"performance"’.

tlp-configuration parameter: string radeon-dpm-state-on-bat

Same as radeon-dpm-state-ac but on BAT mode.

Defaults to ‘"battery"’.

tlp-configuration parameter: string radeon-dpm-perf-level-on-ac

Radeon DPM performance level. Alternatives are auto, low, high.

Defaults to ‘"auto"’.

tlp-configuration parameter: string radeon-dpm-perf-level-on-bat

Same as radeon-dpm-perf-ac but on BAT mode.

Defaults to ‘"auto"’.

tlp-configuration parameter: on-off-boolean wifi-pwr-on-ac?

Wifi power saving mode.

Defaults to ‘#f’.

tlp-configuration parameter: on-off-boolean wifi-pwr-on-bat?

Same as wifi-power-ac? but on BAT mode.

Defaults to ‘#t’.

tlp-configuration parameter: y-n-boolean wol-disable?

Disable wake on LAN.

Defaults to ‘#t’.

tlp-configuration parameter: non-negative-integer sound-power-save-on-ac

Timeout duration in seconds before activating audio power saving on Intel HDA and AC97 devices. A value of 0 disables power saving.

Defaults to ‘0’.

tlp-configuration parameter: non-negative-integer sound-power-save-on-bat

Same as sound-powersave-ac but on BAT mode.

Defaults to ‘1’.

tlp-configuration parameter: y-n-boolean sound-power-save-controller?

Disable controller in powersaving mode on Intel HDA devices.

Defaults to ‘#t’.

tlp-configuration parameter: boolean bay-poweroff-on-bat?

Enable optical drive in UltraBay/MediaBay on BAT mode. Drive can be powered on again by releasing (and reinserting) the eject lever or by pressing the disc eject button on newer models.

Defaults to ‘#f’.

tlp-configuration parameter: string bay-device

Name of the optical drive device to power off.

Defaults to ‘"sr0"’.

tlp-configuration parameter: string runtime-pm-on-ac

Runtime Power Management for PCI(e) bus devices. Alternatives are on and auto.

Defaults to ‘"on"’.

tlp-configuration parameter: string runtime-pm-on-bat

Same as runtime-pm-ac but on BAT mode.

Defaults to ‘"auto"’.

tlp-configuration parameter: boolean runtime-pm-all?

Runtime Power Management for all PCI(e) bus devices, except blacklisted ones.

Defaults to ‘#t’.

tlp-configuration parameter: maybe-space-separated-string-list runtime-pm-blacklist

Exclude specified PCI(e) device addresses from Runtime Power Management.

Defaults to ‘disabled’.

tlp-configuration parameter: space-separated-string-list runtime-pm-driver-blacklist

Exclude PCI(e) devices assigned to the specified drivers from Runtime Power Management.

tlp-configuration parameter: boolean usb-autosuspend?

Enable USB autosuspend feature.

Defaults to ‘#t’.

tlp-configuration parameter: maybe-string usb-blacklist

Exclude specified devices from USB autosuspend.

Defaults to ‘disabled’.

tlp-configuration parameter: boolean usb-blacklist-wwan?

Exclude WWAN devices from USB autosuspend.

Defaults to ‘#t’.

tlp-configuration parameter: maybe-string usb-whitelist

Include specified devices into USB autosuspend, even if they are already excluded by the driver or via usb-blacklist-wwan?.

Defaults to ‘disabled’.

tlp-configuration parameter: maybe-boolean usb-autosuspend-disable-on-shutdown?

Enable USB autosuspend before shutdown.

Defaults to ‘disabled’.

tlp-configuration parameter: boolean restore-device-state-on-startup?

Restore radio device state (bluetooth, wifi, wwan) from previous shutdown on system startup.

Defaults to ‘#f’.

The (gnu services pm) module provides an interface to thermald, a CPU frequency scaling service which helps prevent overheating.

Scheme Variable: thermald-service-type

This is the service type for thermald, the Linux Thermal Daemon, which is responsible for controlling the thermal state of processors and preventing overheating.

Data Type: thermald-configuration

Data type representing the configuration of thermald-service-type.

ignore-cpuid-check? (default: #f)

Ignore cpuid check for supported CPU models.

thermald (default: thermald)

Package object of thermald.


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