Runtime Power Management and ASPM

Scope:

  • Attached PCIe bus devices

RUNTIME_PM_ON_AC/BAT

RUNTIME_PM_ON_AC=on
RUNTIME_PM_ON_BAT=auto

Controls runtime power management for PCIe devices. Possible values:

  • auto – enabled (power down idle devices)

  • on – disabled (devices powered on permanently)

Default when unconfigured: on (AC), auto (BAT)

RUNTIME_PM_DENYLIST

This parameter was renamed with version 1.4. In 1.3.1 and below it is called RUNTIME_PM_BLACKLIST. 1.4 and higher also recognize the old name.

RUNTIME_PM_DENYLIST="11:22.3 44:55.6"

Exclude listed PCIe device addresses from runtime power management. Use lspci to lookup the addresses (first output column).

Important

  • Exclusion of a device means that the value on or auto as initialized by the kernel default at system startup is used and TLP won’t touch it at all

  • A device initialized to auto by the kernel cannot be set to on by entering it into RUNTIME_PM_DENYLIST. Instead use RUNTIME_PM_DISABLE below.

RUNTIME_PM_DRIVER_DENYLIST

This parameter was renamed with version 1.4. In 1.3.1 and below it is called RUNTIME_PM_DRIVER_BLACKLIST. 1.4 and higher also recognize the old name.

RUNTIME_PM_DRIVER_DENYLIST="mei_me nouveau radeon"

Exclude PCIe devices assigned to listed drivers from runtime power management. Use tlp-stat -e to lookup the drivers (in parentheses at the end of each output line).

Separate multiple drivers with spaces.

Default when unconfigured:

“mei_me nouveau radeon” - Version 1.4 and higher
“amdgpu mei_me nouveau nvidia pcieport radeon” - Version 1.3.1 and lower

Note

The default serves to prevent accidential power on of hybrid graphics’ discrete part. Use an empty list (“”) to disable the feature completely (not recommended).

Important

A device initialized to auto by the kernel cannot be set to on by entering its driver into RUNTIME_PM_DRIVER_DENYLIST. Instead use RUNTIME_PM_DISABLE below.

RUNTIME_PM_ENABLE

Version 1.4 and higher

RUNTIME_PM_ENABLE="11:22.3"

Permanently enable (auto) Runtime PM for PCI(e) device addresses in the list (independent of the power source). This has priority over all preceding Runtime PM settings. Separate multiple addresses with spaces. Use lspci to get the adresses (1st column).

RUNTIME_PM_DISABLE

Version 1.4 and higher

RUNTIME_PM_DISABLE="44:55.6"

Permanently disable (on) Runtime PM for PCI(e) device addresses in the list. The configuration works as for RUNTIME_PM_ENABLE above.

PCIE_ASPM_ON_AC/BAT

Active State Power Management (ASPM)

PCIE_ASPM_ON_AC=default
PCIE_ASPM_ON_BAT=default

Sets PCIe ASPM power saving mode. Possible values:

  • default – recommended

  • performance

  • powersave

  • powersupersave

Default when unconfigured: default

Note

Using performance can lead to increasing power consumption and higher temperatures because deeper sleep states of the CPU are no longer reached; default does not cause this. See Issue #344.

See also