linux/Documentation/scsi/link_power_management_policy.txt
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   1This parameter allows the user to set the link (interface) power management.
   2There are 3 possible options:
   3
   4Value                   Effect
   5----------------------------------------------------------------------------
   6min_power               Tell the controller to try to make the link use the
   7                        least possible power when possible.  This may
   8                        sacrifice some performance due to increased latency
   9                        when coming out of lower power states.
  10
  11max_performance         Generally, this means no power management.  Tell
  12                        the controller to have performance be a priority
  13                        over power management.
  14
  15medium_power            Tell the controller to enter a lower power state
  16                        when possible, but do not enter the lowest power
  17                        state, thus improving latency over min_power setting.
  18
  19
  20
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