1

I'm expecting wlan1 (wlan0 is the onboard wifi), however ifconfig doesn't show any new wifi adapter

lsusb

Bus 001 Device 009: ID 7392:b811 Edimax Technology Co., Ltd

dmesg

[ 2230.446927] usb 1-1.3: new high-speed USB device number 9 using dwc_otg
[ 2230.578043] usb 1-1.3: New USB device found, idVendor=7392, idProduct=b811, bcdDevice= 0.00
[ 2230.578063] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2230.578075] usb 1-1.3: Product: Edimax N150 Adapter
[ 2230.578087] usb 1-1.3: Manufacturer: Realtek
[ 2230.578099] usb 1-1.3: SerialNumber: 08xxx

lsmod | grep 8192 returns nothing

Env: Linux raspberrypi 5.4.72-v7+ #1356 SMP Thu Oct 22 13:56:54 BST 2020 armv7l GNU/Linux

jjk
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    Going by https://www.edimax.com/edimax/download/download/data/edimax/global/download/wireless_adapters_n150/ew-7811un_v2 there is only an Ubuntu and Fedora x86 driver - any reason to think the V2 device is OK on the Pi? V1 drivers specifically state the do not work with the V2 adapter... –  Dec 05 '20 at 20:50
  • Thank you. No particula reason. Frankly, I didn't check for the 'V2' term until your answer, seems I'm looking at hassle here. Anymore thoughts? – jjk Dec 06 '20 at 13:39
  • Thank you. No reason, in contrary: I didn't even consider the term "V2" in my pre-sales research..unfortunately. Would you replace the dongle or continue searching? Meanwhile I sent an inquiry about the driver to Edimax' support – jjk Dec 06 '20 at 13:51
  • TBH I've had nothing but pain with USB devices under Linux so I would return it as 'not suitable as advertised'. –  Dec 06 '20 at 16:57
  • Please post the result from lsmod , check if there is a 8192cu loaded? – Mats Karlsson Dec 07 '20 at 02:29
  • @MatsKarlsson See my second last line in question – jjk Dec 07 '20 at 22:44
  • Please post the result from lsmod – Mats Karlsson Dec 10 '20 at 08:51

2 Answers2

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https://www.mail-archive.com/bugs@openbsd.org/msg15706.html

This is information from OpenBSD. You would have to recompile the driver source code for rtwn on the Raspbian Linux.

Notice that the Version 2 Edimax EW-7811un 7932:b811 uses a different RealTek device RTL8188EU than the Version 1 Edimax EW-7811un USB Ids 7932:7811 specifies a RTL8192cu chipset device.

It looks like this device is RTL8188EU based (not RTL8188CU like the 7811Un), since the linux driver they offer for download is called rtl8188EUS, so you'd add

     URTWN_DEV_8188EU(EDIMAX, EW7811UNV2)

to the urtwn device list.

I purchased an Edimax EW-7811Un USB WiFi adapter after a number of suggestions that it is commonly supported by urtwn(4) on OpenBSD, but they seem to be shipping new V2 model which is still identified as Realtek, but has a new device ID of 0xb811 (instead of 0x7811).

How to get Edimax EW-7811un nano USB wifi dongle working. https://www.claudiokuenzler.com/blog/829/how-to-get-edimax-ew-7811un-rtl-realtek-8192cu-working-linux-mint-18.1

I probably did not include all the steps necessary, but this should get you started to a solution. Good luck. How to cross compile for EW-7811un adapter

How to setup a EW-7811un adapater Howchoo Howto web article

Edimax English PDF manual for EW-7811un

wb7odyfred
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This took me far too long to figure out, but in the end I found this guide which shows exactly how to get it working, worked first try for me on a Raspberry Pi CM3: Edimax EW-7811UN V2 driver installation.

To quickly find your kernel version, use the command uname -r. Getting it working does require an existing internet connection, I was using a USB-Ethernet dongle which thankfully didn't need a driver.

Summary in case the link ever dies:

$ sudo apt update && sudo apt upgrade

$ sudo reboot


$ sudo apt install raspberrypi-kernel-headers


$ ls /lib/modules/$(uname -r)

After running the ls command, check to make sure a build folder is visible - if it's not, something's wrong. If all is well, the next step is to find the driver from http://downloads.fars-robotics.net/wifi-drivers/8188eu-drivers/ that matches your kernel (if your kernel ends in v7+ or similar, ignore the +. Download it, unpack it and run install.sh (you may need to run it as superuser). Reboot the Pi and you should be good to go!

Isaac Middlemiss
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