Пробую TP-LINK TL-WN725N ver.2

Rasberry опознал адаптер

Aug 22 05:36:48 raspberrypi kernel: [  341.050791] usb 1-1.3: new high-speed USB device number 4 using dwc_otg
Aug 22 05:36:48 raspberrypi kernel: [  341.154043] usb 1-1.3: New USB device found, idVendor=0bda, idProduct=8179
Aug 22 05:36:48 raspberrypi kernel: [  341.154070] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Aug 22 05:36:49 raspberrypi kernel: [  341.225485] r8188eu: module is from the staging directory, the quality is unknown, you have been warned.
Aug 22 05:36:49 raspberrypi kernel: [  341.234937] Chip Version Info: CHIP_8188E_Normal_Chip_TSMC_D_CUT_1T1R_RomVer(0)
Aug 22 05:36:49 raspberrypi kernel: [  341.273148] usbcore: registered new interface driver r8188eu
Aug 22 05:36:49 raspberrypi dhcpcd[2905]: all: IPv6 kernel autoconf disabled
Aug 22 05:36:49 raspberrypi dhcpcd[2905]: wlan0: adding address fe80::c7a:b92a:24c3:b5c
Aug 22 05:36:49 raspberrypi dhcpcd[2905]: if_addaddress6: Operation not supported
Aug 22 05:36:49 raspberrypi ifplugd(wlan0)[3025]: ifplugd 0.28 initializing.
Aug 22 05:36:49 raspberrypi kernel: [  341.377125] r8188eu 1-1.3:1.0: Direct firmware load for rtlwifi/rtl8188eufw.bin failed with error -2
Aug 22 05:36:49 raspberrypi kernel: [  341.377163] r8188eu 1-1.3:1.0: Firmware rtlwifi/rtl8188eufw.bin not available
Aug 22 05:36:49 raspberrypi kernel: [  341.377182] MAC Address = 14:cc:20:16:3a:52
Aug 22 05:36:49 raspberrypi ifplugd(wlan0)[3025]: Using interface wlan0/14:CC:20:16:3A:52 with driver <r8188eu> (version: )
Aug 22 05:36:49 raspberrypi ifplugd(wlan0)[3025]: Using detection mode: wireless extension
Aug 22 05:36:49 raspberrypi ifplugd(wlan0)[3025]: Initialization complete, link beat not detected.
Aug 22 05:36:49 raspberrypi kernel: [  341.587827] usb 1-1.3: USB disconnect, device number 4
Aug 22 05:36:49 raspberrypi kernel: [  341.588501] R8188EU: ERROR indicate disassoc
Aug 22 05:36:49 raspberrypi avahi-daemon[2172]: Withdrawing workstation service for wlan0.
Aug 22 05:36:49 raspberrypi dhcpcd[2905]: wlan0: if_up: No such device
Aug 22 05:36:49 raspberrypi dhcpcd[2905]: wlan0: waiting for carrier
Aug 22 05:36:49 raspberrypi dhcpcd[2905]: wlan0: removing interface
Aug 22 05:36:49 raspberrypi ifplugd(wlan0)[3025]: Exiting.

Не смог загрузить прошивку

Aug 22 05:36:49 raspberrypi kernel: [  341.377125] r8188eu 1-1.3:1.0: Direct firmware load for rtlwifi/rtl8188eufw.bin failed with error -2
Aug 22 05:36:49 raspberrypi kernel: [  341.377163] r8188eu 1-1.3:1.0: Firmware rtlwifi/rtl8188eufw.bin not available

Пробовал так
1. https://www.raspberrypi.org/fo[..]ic.php?f=33&t=108075 – не вышло

wget https://dl.dropboxusercontent.com/u/80256631/8812au-3.18.7-v7-755.tar.gz
tar xzf 8812au-3.18.7-v7-755.tar.gz
./install.sh

2. http://forum.xbian.org/printthread.php?tid=2524 – получилось

sudo wget -O /lib/firmware/rtlwifi/rtl8188eufw.bin https://github.com/OpenELEC/wlan-firmware/blob/master/firmware/rtlwifi/rtl8188eufw.bin?raw=true

файл /etc/network/interfaces

auto lo

iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

файл /etc/wpa_supplicant/wpa_supplicant.conf

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
        ssid="NETWORK_NAME"
        psk="NETWORK_PASSWORD"
}

Все нормально, сеть есть.