CONFIG_SATA_MOBILE_LPM_POLICY: Default SATA Link Power Management policy

General informations

The Linux kernel configuration item CONFIG_SATA_MOBILE_LPM_POLICY has multiple definitions:

Default SATA Link Power Management policy found in drivers/ata/Kconfig

The configuration item CONFIG_SATA_MOBILE_LPM_POLICY:

• prompt: Default SATA Link Power Management policy
• type: int
• depends on: CONFIG_SATA_AHCI
• defined in drivers/ata/Kconfig
• found in Linux kernels: 6.9–6.16, 6.17-rc+HEAD

Help text

Select the Default SATA Link Power Management (LPM) policy to use for chipsets / "South Bridges" supporting low-power modes. Such chipsets are ubiquitous across laptops, desktops and servers. Each policy combines power saving states and features: - Partial: The Phy logic is powered but is in a reduced power state. The exit latency from this state is no longer than 10us). - Slumber: The Phy logic is powered but is in an even lower power state. The exit latency from this state is potentially longer, but no longer than 10ms. - DevSleep: The Phy logic may be powered down. The exit latency from this state is no longer than 20 ms, unless otherwise specified by DETO in the device Identify Device Data log. - HIPM: Host Initiated Power Management (host automatically transitions to partial and slumber). - DIPM: Device Initiated Power Management (device automatically transitions to partial and slumber).

The possible values for the default SATA link power management policies are: 0 => Keep firmware settings 1 => No power savings (maximum performance) 2 => HIPM (Partial) 3 => HIPM (Partial) and DIPM (Partial and Slumber) 4 => HIPM (Partial and DevSleep) and DIPM (Partial and Slumber) 5 => HIPM (Slumber and DevSleep) and DIPM (Partial and Slumber)

Excluding the value 0, higher values represent policies with higher power savings.

Default SATA Link Power Management policy for low power chipsets found in drivers/ata/Kconfig

The configuration item CONFIG_SATA_MOBILE_LPM_POLICY:

• prompt: Default SATA Link Power Management policy for low power chipsets
• type: int
• depends on: CONFIG_SATA_AHCI
• defined in drivers/ata/Kconfig
• found in Linux kernels: 5.18–5.19, 6.0–6.8

Help text

Select the Default SATA Link Power Management (LPM) policy to use for chipsets / "South Bridges" supporting low-power modes. Such chipsets are typically found on most laptops but desktops and servers now also widely use chipsets supporting low power modes.

The value set has the following meanings: 0 => Keep firmware settings 1 => Maximum performance 2 => Medium power 3 => Medium power with Device Initiated PM enabled 4 => Minimum power

Note "Minimum power" is known to cause issues, including disk corruption, with some disks and should not be used.

Default SATA Link Power Management policy for mobile chipsets found in drivers/ata/Kconfig

The configuration item CONFIG_SATA_MOBILE_LPM_POLICY:

• prompt: Default SATA Link Power Management policy for mobile chipsets
• type: int
• depends on: CONFIG_SATA_AHCI
• defined in drivers/ata/Kconfig
• found in Linux kernels: 4.16–4.20, 5.0–5.17, 5.17+HEAD

Help text

Select the Default SATA Link Power Management (LPM) policy to use for mobile / laptop variants of chipsets / "South Bridges".

The value set has the following meanings: 0 => Keep firmware settings 1 => Maximum performance 2 => Medium power 3 => Medium power with Device Initiated PM enabled 4 => Minimum power

Note "Minimum power" is known to cause issues, including disk corruption, with some disks and should not be used.

Hardware

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