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