Wifi over TP-Link TL-WN821N v3

[Corvin]

Hello

I have a strange issue with my TP-Link TL-WN821N v3 wifi dongle. I am powering Raspi of HTC USB charger (1.0A) and the USB wifi dongle is conected through Sandberg 7ports USB hub (powered). The problem is, that on Raspi I can see only a few wireless networks instead of whole lot I can access plugging the same dongle into my laptop. Is this may be the insufficient power supply problem? Does anybody know how much power does the TP-Link TL-WN821N v3 dongle require for proper working?

[Corvin]

Ok. I was running some tests and I can connect easily with the provisional wifi network, which I have set up. Surprisingly the network disappears (!) when I change the broadcasting channel to 12 or 13! I cannot see any network broadcasting on those channels, so I assume it is a driver / firmware problem - anybody any help with that?

[Corvin]

It looks like I am alone in here... but I solved the problem! after few hours of googling and experimenting.

All I had to do was to change the local regdom of the card to allow the frequencies in GB. I have installed CRDA and edited

Code: Select all

/etc/conf.d/wireless-regdom

adding

Code: Select all

WIRELESS_REGDOM="GB"

after rebooting I could see all the networks and I could connect to any of them...
Problem solved!!!
You can read some more at: http://linuxwireless.org/en/developers/Regulatory/

[marosg]

I had the same issue with a different USB wifi adapter (some old Siemens). I managed to get it working (needed some firmware update, thank you Google). Later my connectivity just disappeared and I found a message about CRDA regulatory in dmesg. Again Google, I had to install iw package which installed also crda package (it is the latest Raspbian). I realized my country code for this regulatory stuff was set to 00. I edited /etc/default/crda file, rebooted and voila, now it keeps working.