pi@raspbmc:~$ sudo lsusb
Bus 001 Device 004: ID 20f4:648b
Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
pi@raspbmc:~$ dmesg -s 1
saving_ctrl_wk_hdl change rf to OFF...LED(0x00020808)....
[  123.112051]
[  123.112065] ===> rtw_ips_pwr_down...................
[  123.112493] ====> rtw_ips_dev_unload...
[  123.156432] usb_read_port_cancel
[  123.156583] usb_write_port_cancel
[  123.156710] ==> rtl8192cu_hal_deinit
[  123.156724] bkeepfwalive(0)
[  123.156736] card disble without HWSM...........
[  123.166262] <=== rtw_ips_pwr_down..................... in 50ms
[  127.560190]
[  127.560207]  rfpwrstate_check call ips_leave....
[  127.560232] ==>ips_leave cnts:1
[  127.560244] ===>  rtw_ips_pwr_up..............
[  127.560280] ===> ips_netdrv_open.........
[  127.575421]  ===> FirmwareDownload91C() fw:Rtl819XFwImageArray_TSMC
[  127.575457] FirmwareDownload92C accquire FW from embedded image
[  127.575476] fw_ver=v80, fw_subver=0, sig=0x88c0
[  127.634918] fw download ok!
[  127.634948] Set RF Chip ID to RF_6052 and RF type to 1T1R.
[  128.164637] IQK:Start!!!
[  128.190139] Path A IQK Success!!
[  128.204134] Path A IQK Success!!
[  128.218150] IQK: final_candidate is 0
[  128.218195] IQK: RegE94=100 RegE9C=10 RegEA4=fe RegEAC=2 RegEB4=0 RegEBC=0 RegEC4=0 RegECC=0
[  128.218206]  Path A IQ Calibration Success !
[  128.339287] pdmpriv->TxPowerTrackControl = 1
[  128.347899] MAC Address from REG_MACID = 00:14:d1:ec:33:58
[  128.347938] rtl8192cu_hal_init in 790ms
[  128.348044] <===  rtw_ips_pwr_up.............. in 790ms
[  128.348266] ==> ips_leave.....LED(0x00028080)...
[  129.672561] survey done event(15)
[  130.341697] ==>pwr_state_check_handler .fw_state(8)
[  130.341731] ==> rtw_ps_cmd  , enqueue CMD
[  130.341797] ==>rtw_ps_processor .fw_state(8)
[  130.341814] ==>ips_enter cnts:2
[  130.342046] ==>power_saving_ctrl_wk_hdl change rf to OFF...LED(0x00028000)....
[  130.342058]
[  130.342072] ===> rtw_ips_pwr_down...................
[  130.342514] ====> rtw_ips_dev_unload...
[  130.396750] usb_read_port_cancel
[  130.396893] usb_write_port_cancel
[  130.397021] ==> rtl8192cu_hal_deinit
[  130.397044] bkeepfwalive(0)
[  130.397055] card disble without HWSM...........
[  130.405655] <=== rtw_ips_pwr_down..................... in 60ms
[  139.819502]
[  139.819515]  rfpwrstate_check call ips_leave....
[  139.819541] ==>ips_leave cnts:2
[  139.819565] ===>  rtw_ips_pwr_up..............
[  139.819590] ===> ips_netdrv_open.........
[  139.839091]  ===> FirmwareDownload91C() fw:Rtl819XFwImageArray_TSMC
[  139.839129] FirmwareDownload92C accquire FW from embedded image
[  139.839149] fw_ver=v80, fw_subver=0, sig=0x88c0
[  139.911955] fw download ok!
[  139.911984] Set RF Chip ID to RF_6052 and RF type to 1T1R.
[  140.474672] IQK:Start!!!
[  140.489923] Path A IQK Success!!
[  140.508670] Path A IQK Success!!
[  140.516180] IQK: final_candidate is 0
[  140.516221] IQK: RegE94=100 RegE9C=f RegEA4=fe RegEAC=2 RegEB4=0 RegEBC=0 RegEC4=0 RegECC=0
[  140.516233]  Path A IQ Calibration Success !
[  140.639181] pdmpriv->TxPowerTrackControl = 1
[  140.647682] MAC Address from REG_MACID = 00:14:d1:ec:33:58
[  140.647720] rtl8192cu_hal_init in 830ms
[  140.647821] <===  rtw_ips_pwr_up.............. in 830ms
[  140.648045] ==> ips_leave.....LED(0x00028080)...
[  141.992450] survey done event(18)
[  142.641674] ==>pwr_state_check_handler .fw_state(8)
[  142.641715] ==> rtw_ps_cmd  , enqueue CMD
[  142.641773] ==>rtw_ps_processor .fw_state(8)
[  142.641791] ==>ips_enter cnts:3
[  142.642054] ==>power_saving_ctrl_wk_hdl change rf to OFF...LED(0x00028000)....
[  142.642066]
[  142.642090] ===> rtw_ips_pwr_down...................
[  142.642541] ====> rtw_ips_dev_unload...
[  142.683287] usb_read_port_cancel
[  142.683414] usb_write_port_cancel
[  142.683539] ==> rtl8192cu_hal_deinit
[  142.683561] bkeepfwalive(0)
[  142.683572] card disble without HWSM...........
[  142.702440] <=== rtw_ips_pwr_down..................... in 60ms
pi@raspbmc:~$ sudo iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     unassociated  Nickname:"<WIFI@REALTEK>"
          Mode:Managed  Frequency=2.412 GHz  Access Point: Not-Associated
          Sensitivity:0/0
          Retry:off   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

pi@raspbmc:~$ sudo iwlist wlan0 scanning
wlan0     Scan completed :
          Cell 01 - Address: 08:76:FF:C9:6F:20
                    ESSID:"Thomson-08-76-FF-C9-6F-20"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Frequency:2.412 GHz (Channel 1)
                    Encryption key:on
                    Bit Rates:54 Mb/s
                    Extra:wpa_ie=dd1c0050f20101000050f20202000050f2040050f20201000050f2020000
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Extra:rsn_ie=30180100000fac020200000fac04000fac020100000fac020000
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Quality=100/100  Signal level=44/100
          Cell 02 - Address: 00:26:44:04:DE:45
                    ESSID:"ww5"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Frequency:2.412 GHz (Channel 1)
                    Encryption key:on
                    Bit Rates:54 Mb/s
                    Extra:wpa_ie=dd1c0050f20101000050f20202000050f2040050f20201000050f2020000
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Extra:rsn_ie=30180100000fac020200000fac04000fac020100000fac020000
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    Quality=100/100  Signal level=53/100
          Cell 03 - Address: 08:76:FF:0D:23:B1
                    ESSID:"Toivo73"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Frequency:2.437 GHz (Channel 6)
                    Encryption key:on
                    Bit Rates:54 Mb/s
                    Extra:rsn_ie=30140100000fac040100000fac040100000fac020000
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
                    Quality=100/100  Signal level=50/100
          Cell 04 - Address: 00:1E:E5:8C:C3:56
                    ESSID:"linksysW"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Frequency:2.452 GHz (Channel 9)
                    Encryption key:on
                    Bit Rates:54 Mb/s
                    Extra:wpa_ie=dd160050f20101000050f20201000050f20201000050f202
                    IE: WPA Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (1) : TKIP
                        Authentication Suites (1) : PSK
                    Quality=82/100  Signal level=42/100
          Cell 05 - Address: 00:18:E7:D1:53:24
                    ESSID:"supanetwork"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.472 GHz (Channel 13)
                    Encryption key:on
                    Bit Rates:144 Mb/s
                    Extra:rsn_ie=30180100000fac020200000fac02000fac040100000fac020000
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : TKIP CCMP
                        Authentication Suites (1) : PSK
                    IE: Unknown: DD7F0050F204104A0001101044000102103B000103104700103C004371518539ACA041D1279B5F7BA31021000E442D4C696E6B2053797374656D73102300074449522D363535102400024134104200046E6F6E651054000800060050F204000110110017587472656D65204E204749474142495420526F75746572100800020084
                    Quality=100/100  Signal level=43/100