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You can try the following commands.
wl mpc 0 (default:1)
0=Disable minimum power control mode (required prior to WLAN RF/MFG
1=Enable minimum power control mode (this is the default mode for
non-MFG F/W and most MFG F/W)
returns : The power management mode, 0=CAM(Constantly awake),
1=PS(power-save), 2=FAST PS mode
In the BRCM WLAN driver, FAST PS mode consumes slightly more power
than the standard PS mode, but can operate at higher rates(close to
The difference btw FAST&PS is dependent on the usage model
1) If there is no traffic, there is no difference.
2) If the traffic is a ready stream(some packets every DTIM),
there is no difference
3) IF the traffic is a stream that happens less often than
every DTIM, then the adapter consumes more power in FAST PS mode and
less power but more latency in PS mode. the amount of power difference
depends on the frequency of traffic.