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trovata miniguida su altro forum su come risolvere problema conTP-LiNK TL-WN821N ver4
#1
Smile 
Ciao a tutti,sono un neofito di linux ma ora installato solo la mint 17.1 Smile
Dapprima avevo installato ubuntu 14.4 lts, poi non riuscendo a far funzionare l'adattatore wi-fi sopra indicato,ho provato a installare la mint 17.1. Purtroppo mi si erano ripresentati gli stessi problemi e ho visto che era un problema generalizzato a molti utenti.Deciso a non installare i drivers per windows, ho cercato su vari forum e ho trovato la soluzione sul forum di mint,vi posto la guida perche' a me sembra aver risolto il problema Smile 

Re: usb wireless card giving troubles
[Immagine: http://forums.linuxmint.com/styles/linux...target.gif]by catfish12 on Sun Feb 16, 2014 9:21 am
heres a fix IF IT IS A rtl8192cu

Luckily there's a solution that'll make such a chipset run stable and fast, namely replacing the defective driver by a better one. This solution is necessary both in Ubuntu 12.04 (Mint 13 Maya) and in Ubuntu 13.10 (Mint 16 Petra).

This is how to do it:


1. First check whether the buggy driver rtl8192cu is active in your operating system.

Click on the grey Ubuntu logo (Dash home). Query: terminal.
Click on Terminal.

Use copy/paste to transfer the following line into the terminal:

lsmod | grep rtl

Press Enter.

When you see one or more times rtl8192cu in the terminal output, then it's active. In that case proceed with step 2.


2. Disconnect your wireless connection, and temporarily connect by means of an ethernet cable (or by means of another wireless chipset that does function well).


3. Now install some applications for building the right driver. Click on the grey Ubuntu logo (Dash home). Query: terminal.
Click on Terminal.

Type (use copy/paste):

sudo apt-get install linux-headers-generic build-essential dkms git

Press Enter and submit your password. Please note that the password will remain invisible, not even asterisks will show, which is normal.

Wait until the installation has completed.


4. Now download the source code of the right driver as follows. Copy and paste the following command line into the terminal:

git clone https://github.com/pvaret/rtl8192cu-fixes.git

Press Enter.


5. Set it up as a DKMS module. Copy and paste into the terminal:

sudo dkms add ./rtl8192cu-fixes

Press Enter and if prompted, submit your password. Please note that the password will remain invisible, not even asterisks will show, which is normal.


6. Build and install the new driver. Copy and paste into the terminal:

sudo dkms install 8192cu/1.8

Press Enter.


7. Refresh the module list. Copy and paste into the terminal:

sudo depmod -a

Press Enter.


8. Blacklist the faulty driver. Copy and paste into the terminal:

sudo cp ./rtl8192cu-fixes/blacklist-native-rtl8192.conf /etc/modprobe.d/

Press Enter.


9. Reboot your computer.


10. The problem should now be solved: disconnect the temporary ethernet cable and insert the Realtek device again.

With the following terminal command you can check whether the right driver is active now:

lsmod | grep 8192

Press Enter.

In the terminal output you should see that the new driver 8192cu is active. You should see no mention anymore of the old driver rtl8192cu.

Note: a possibly surprising side effect might be, that the light on your wireless card is blinking constantly now. That's normal: the light is blinking whenever data are being sent or received.

Ciao a tutti
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Grazie per la segnalazione.
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