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Hi I bought this Comfast Wifi Adapter WU810n and came to know that it's not supported by raspbian directly. So I did follow http://www.raspberrypi.org/forums/viewtopic.php?f=28&t=62371 and get it working. But yesterday I flashed my sd-card with the lastest raspbian version and now when I run lsusb it doesn't show Realtek. 

pi@raspberrypi ~ $ lsusb 
Bus 001 Device 002: ID 0424:9514 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.

When I run dmesg this is the output I get :

[139.747787] usb 1-1.2: new high-speed USB device number 4 using dwc_otg
[  139.849099] usb 1-1.2: New USB device found, idVendor=0bda, idProduct=8179
[  139.849142] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  139.849161] usb 1-1.2: Product: 802.11n NIC
[  139.849178] usb 1-1.2: Manufacturer: Realtek
[  139.849194] usb 1-1.2: SerialNumber: 00F1408816F7
[  139.929687] r8188eu: module is from the staging directory, the quality is unknown, you have been warned.
[  139.948403] Chip Version Info: CHIP_8188E_Normal_Chip_TSMC_UNKNOWN_CUT(10)_1T1R_RomVer(0)
[  139.992479] usbcore: registered new interface driver r8188eu
[  140.213122] r8188eu 1-1.2:1.0: Direct firmware load for rtlwifi/rtl8188eufw.bin failed with error -2
[  140.213169] r8188eu 1-1.2:1.0: Firmware rtlwifi/rtl8188eufw.bin not available
[  140.213192] MAC Address = 00:f1:40:88:16:f7
[  140.285819] usb 1-1.2: USB disconnect, device number 4
[  140.286600] R8188EU: ERROR indicate disassoc
Ghanima
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Sushant Kolhe
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3 Answers3

2

If an adapter doesn't show up in lsusb that usually means that it needs firmware file(s) and your dmesg output proves that:

[  140.213122] r8188eu 1-1.2:1.0: Direct firmware load for rtlwifi/rtl8188eufw.bin failed with error -2
[  140.213169] r8188eu 1-1.2:1.0: Firmware rtlwifi/rtl8188eufw.bin not available

Installing the firmware-realtek package should fix that. Make sure you have non-free in your /etc/apt/sources.list file, otherwise it won't find it.

Diederik de Haas
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0

I had similar issue with external wifi dongle. Error found in logs /var/log/kern.log and other sys log files:

root@raspberrypi:/var/log# more /etc/debian_version
7.8
Jul  3 14:07:35 raspberrypi kernel: [  334.291672] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Jul  3 14:07:35 raspberrypi kernel: [  334.291689] usb 1-1.2: Product: 802.11n NIC
Jul  3 14:07:35 raspberrypi kernel: [  334.291706] usb 1-1.2: Manufacturer: Realtek
Jul  3 14:07:35 raspberrypi kernel: [  334.293224] Chip Version Info: CHIP_8188E_Normal_Chip_TSMC_UNKNOWN_CUT(10)_1T1R_RomVer(0)
Jul  3 14:07:35 raspberrypi kernel: [  334.453224] r8188eu 1-1.2:1.0: Direct firmware load for rtlwifi/rtl8188eufw.bin failed with error -2
Jul  3 14:07:35 raspberrypi kernel: [  334.453258] r8188eu 1-1.2:1.0: Firmware rtlwifi/rtl8188eufw.bin not available
Jul  3 14:07:35 raspberrypi kernel: [  334.453274] MAC Address = <mac adddr>
Jul  3 14:07:35 raspberrypi kernel: [  334.468794] usb 1-1.2: USB disconnect, device number 5
Jul  3 14:07:35 raspberrypi kernel: [  334.469531] R8188EU: ERROR indicate disassoc
Jul  3 14:07:47 raspberrypi kernel: [  345.619686] nr_pdflush_threads exported in /proc is scheduled for removal

Solution was found at : Here

sudo wget https://github.com/lwfinger/rtl8188eu/raw/c83976d1dfb4793893158461430261562b3a5bf0/rtl8188eufw.bin  -O /lib/firmware/rtlwifi/rtl8188eufw.bin

Just replug the wifi device and it should start glowing! I tried multiple methods but didn't worked for me.

If above firmware change didn't help. Pls follow this . Means, you have to do config/setup required after firmware part is done ie setting up wpa_supplicant OR setting correct /etc/network/interfaces file. My file looks like:

root@raspberrypi:/var/log# cat /etc/network/interfaces
auto lo

iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
auto wlan0

iface wlan0 inet dhcp
        wpa-ssid "SID_name"
        wpa-psk "your_password"

Good luck! If above didn't work for you, let me know in comments. :)

Mahen
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-1

Flashing the SD-Card may have un-done the changes you did. Follow the same instructions you did to get it working the first time.

Matthew
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