jasonw2012
Posts: 2
Joined: Fri Aug 07, 2015 11:10 am

Edimax EW-7811UTC Help

Fri Aug 07, 2015 11:18 am

Hi,

I'm a beginner with the raspberry pi 2 B and I also got a Edimax EW-7811UTC wifi adapter, running raspberrypi 3.18.11-v7+ #781 Raspbian, however no matter how much I look on the forums, I just can't get it to work. lsusb detects the device but I don't have the driver installed for it. How can I install the driver and get it working? Any help appreciated!

JimmyN
Posts: 1109
Joined: Wed Mar 18, 2015 7:05 pm
Location: Virginia, USA

Re: Edimax EW-7811UTC Help

Fri Aug 07, 2015 1:35 pm

What do you get from the command:

Code: Select all

lsmod
In the module column on the left you should see "8192cu" listed.

Then try:

Code: Select all

dmesg |grep 8192cu
You should see something like " [ 9.465104] usbcore: registered new interface driver rtl8192cu

MrEngman
Posts: 3850
Joined: Fri Feb 03, 2012 2:17 pm
Location: Southampton, UK

Re: Edimax EW-7811UTC Help

Fri Aug 07, 2015 3:50 pm

Try this to install the driver

Code: Select all

wget https://dl.dropboxusercontent.com/u/80256631/8812au-3.18.11-v7-781.tar.gz
tar xzf 8812au-3.18.11-v7-781.tar.gz
./install.sh
After installing reboot and then configure you wifi to connect to your network.


MrEngman
Simplicity is a prerequisite for reliability. Edsger W. Dijkstra

Please post ALL technical questions on the forum. Please Do Not send private messages.

MrEngman
Posts: 3850
Joined: Fri Feb 03, 2012 2:17 pm
Location: Southampton, UK

Re: Edimax EW-7811UTC Help

Fri Aug 07, 2015 3:52 pm

JimmyN wrote:What do you get from the command:

Code: Select all

lsmod
In the module column on the left you should see "8192cu" listed.

Then try:

Code: Select all

dmesg |grep 8192cu
You should see something like " [ 9.465104] usbcore: registered new interface driver rtl8192cu
That wifi module does not use the 8192cu driver so he will not see anything about the 8192cu using dmesg.


MrEngman
Simplicity is a prerequisite for reliability. Edsger W. Dijkstra

Please post ALL technical questions on the forum. Please Do Not send private messages.

JimmyN
Posts: 1109
Joined: Wed Mar 18, 2015 7:05 pm
Location: Virginia, USA

Re: Edimax EW-7811UTC Help

Fri Aug 07, 2015 4:05 pm

MrEngman wrote: That wifi module does not use the 8192cu driver so he will not see anything about the 8192cu using dmesg.


MrEngman
That's interesting, as that's what all my Edimax EW7811 [Realtek RTL8188CUS] adapters use.

Code: Select all

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.
Bus 001 Device 004: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
Bus 001 Device 005: ID 1997:2433
Bus 001 Device 006: ID 13fe:5200 Kingston Technology Company Inc.


lsmod
Module                  Size  Used by
ecb                     2279  0
md4                     3587  0
md5                     2045  1
hmac                    3067  1
cpufreq_stats           4433  0
nls_utf8                1443  1
cifs                  310275  2
i2c_dev                 6709  2
snd_bcm2835            21149  3
snd_pcm                90778  1 snd_bcm2835
snd_seq                61097  0
snd_seq_device          7209  1 snd_seq
snd_timer              23007  2 snd_pcm,snd_seq
snd                    66325  11 snd_bcm2835,snd_timer,snd_pcm,snd_seq,snd_seq_device
sg                     21859  0
evdev                  11000  4
joydev                  9766  0
i2c_bcm2708             6200  0
8192cu                569561  0
uio_pdrv_genirq         3666  0
uio                     9897  1 uio_pdrv_genirq


dmesg |grep 8192cu
[    9.465104] usbcore: registered new interface driver rtl8192cu
So I should be using a different driver? The 8192cu has always worked fine for me and it's included in Raspbian.

MrEngman
Posts: 3850
Joined: Fri Feb 03, 2012 2:17 pm
Location: Southampton, UK

Re: Edimax EW-7811UTC Help

Fri Aug 07, 2015 4:13 pm

JimmyN wrote:
MrEngman wrote: That wifi module does not use the 8192cu driver so he will not see anything about the 8192cu using dmesg.


MrEngman
That's interesting, as that's what all my Edimax EW7811 adapters use.

Code: Select all

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.
Bus 001 Device 004: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
Bus 001 Device 005: ID 1997:2433
Bus 001 Device 006: ID 13fe:5200 Kingston Technology Company Inc.


lsmod
Module                  Size  Used by
ecb                     2279  0
md4                     3587  0
md5                     2045  1
hmac                    3067  1
cpufreq_stats           4433  0
nls_utf8                1443  1
cifs                  310275  2
i2c_dev                 6709  2
snd_bcm2835            21149  3
snd_pcm                90778  1 snd_bcm2835
snd_seq                61097  0
snd_seq_device          7209  1 snd_seq
snd_timer              23007  2 snd_pcm,snd_seq
snd                    66325  11 snd_bcm2835,snd_timer,snd_pcm,snd_seq,snd_seq_device
sg                     21859  0
evdev                  11000  4
joydev                  9766  0
i2c_bcm2708             6200  0
8192cu                569561  0
uio_pdrv_genirq         3666  0
uio                     9897  1 uio_pdrv_genirq


dmesg |grep 8192cu
[    9.465104] usbcore: registered new interface driver rtl8192cu
So I should be using a different driver? The 8192cu has always worked fine for me and it's included in Raspbian.
We are talking about two different wifi adapters.

Your wifi is an Edimax EW-7811Un and yes it uses the 8192cu driver. The wifi the OP is using is an Edimax EW-7811UTC and uses the 8812au/8821au driver, not the 8192cu driver.


MrEngman
Simplicity is a prerequisite for reliability. Edsger W. Dijkstra

Please post ALL technical questions on the forum. Please Do Not send private messages.

JimmyN
Posts: 1109
Joined: Wed Mar 18, 2015 7:05 pm
Location: Virginia, USA

Re: Edimax EW-7811UTC Help

Fri Aug 07, 2015 4:18 pm

OK, thanks for the clarification and correction.

jasonw2012
Posts: 2
Joined: Fri Aug 07, 2015 11:10 am

Re: Edimax EW-7811UTC Help

Fri Aug 07, 2015 5:56 pm

MrEngman wrote:Try this to install the driver

Code: Select all

wget https://dl.dropboxusercontent.com/u/80256631/8812au-3.18.11-v7-781.tar.gz
tar xzf 8812au-3.18.11-v7-781.tar.gz
./install.sh
After installing reboot and then configure you wifi to connect to your network.


MrEngman
I successfully got the driver installed and (after a bit of tinkering with the wpa_supplicant file) got wifi! :D Thank you MrEngman – as well as JimmyN – for replying.

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