Re: [patch 3/3] Enable Aggressive Link Power management for AHCI controllers.

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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 <kristen.c.accardi@xxxxxxxxx>

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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