When running the commands (sudo iwconfig wlan0 power on/sudo iwconfig
wlan0 power off) with Natty's default drivers, they complete
successfully without anything being displayed on the screen (I didn't
try iwconfig); however, when I run them with the latest wireless driver,
I get the following outputs:

$ sudo iwconfig wlan0 power off
Error for wireless request "Set Power Management" (8B2C) :
    SET failed on device wlan0 ; Operation not supported.

$ sudo iwconfig wlan0 power on
Error for wireless request "Set Power Management" (8B2D) :
    GET failed on device wlan0 ; Operation not supported.

$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     Ralink STA  ESSID:"BTHomeHub2-M5M3"  Nickname:"RT2860STA"
          Mode:Managed  Frequency=2.452 GHz  Access Point: 00:21:04:AA:EE:CA   
          Bit Rate=54 Mb/s   
          RTS thr:off   Fragment thr:off
          Link Quality=85/100  Signal level:-59 dBm  Noise level:-83 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

I'm not sure how to tell if power saving is on or off, I would guess it
probably isn't on with the new drivers.

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https://bugs.launchpad.net/bugs/769504

Title:
  RT3090 Internal Wi-fi Stability/Connectivity Issue

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