Messages in this thread | | | Date | Mon, 11 Jun 2007 16:01:13 -0400 | From | Jeff Garzik <> | Subject | 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@intel.com>
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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