This parameter allows the user to set the link (interface) power management.
  There are 3 possible options:
  
  Value			Effect
  ----------------------------------------------------------------------------
  min_power		Tell the controller to try to make the link use the
  			least possible power when possible.  This may
  			sacrifice some performance due to increased latency
  			when coming out of lower power states.
  
  max_performance		Generally, this means no power management.  Tell
  			the controller to have performance be a priority
  			over power management.
  
  medium_power		Tell the controller to enter a lower power state
  			when possible, but do not enter the lowest power
  			state, thus improving latency over min_power setting.