I have the exact same model and problem as the OP. FWIW here's output of iwconfig:
$ iwconfig lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=off Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off
ppp0 no wireless extensions.
I have the exact same model and problem as the OP. FWIW here's output of iwconfig:
$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:off/any
Mode: Managed Access Point: Not-Associated Tx-Power=off
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
ppp0 no wireless extensions.