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SubjectRe: [patch 3/3] Enable Aggressive Link Power management for AHCI controllers.
Kristen Carlson Accardi wrote:
> This patch will set the correct bits to turn on Aggressive
> Link Power Management (ALPM) for the ahci driver. This
> will cause the controller and disk to negotiate a lower
> power state for the link when there is no activity (see
> the AHCI 1.x spec for details). This feature is mutually
> exclusive with Hot Plug, so when ALPM is enabled, Hot Plug
> is disabled. ALPM will be enabled by default, but it is
> settable via the scsi host syfs interface. Possible
> settings for this feature are:
> Setting Effect
> ----------------------------------------------------------
> min_power ALPM is enabled, and link set to enter
> lowest power state (SLUMBER) when idle
> Hot plug not allowed.
> max_performance ALPM is disabled, Hot Plug is allowed
> medium_power ALPM is enabled, and link set to enter
> second lowest power state (PARTIAL) when
> idle. Hot plug not allowed.
> Signed-off-by: Kristen Carlson Accardi <>

seems OK at first glance, though I'll have questions about hardware
behavior once I get off this day-long Intel conference call :)

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