The Official driver for EW-7811Un supports Linux kernel up to v3.9 only.  Any versions higher than that are not supported.  However, starting from kernel v3.10, there is a built-in driver for our EW-7811Un.  You don't need to install any driver, i.e. Plug-and-Play.

If you have issue(s) with the built-in driver, it may be related to this bug.  The solution is to use an open source driver from github as suggested from the bug report's comment #8.

Here's the instructions on how to install the open source driver from github on Debian-based Linux OS with kernel v3.10 or higher.  Installation is done using Command Line Interface (CLI) in a Terminal program.  Commands are in green below and you should type them in one command at a time.

  • plugin the EW-7811Un to your system's USB port (2.0 preferred)
  • make sure your system has temporary Internet connection
  • open a Terminal program
  • make sure your system is up-to-date
    sudo apt-get update
    sudo apt-get upgrade
    sudo apt-get dist-upgrade

    Note:  You may need to restart your system if kernel update has been installed. ]
  • install the necessary files to compile a device driver
    sudo apt-get install linux-headers-$(uname -r) build-essential dkms git
  • restart your system
    sudo reboot
  • after finished booting up, open a Terminal program again
  • clone the github repository
    git clone
    Note:  Right after "rt", it is a letter "l" (like Larry), not a number "1" (like 1980.)  Typing it wrong will cause GitHub to ask for Username and Password.  Please note that accordingly. ]
  • setup as DKMS module
    sudo dkms add ./rtl8192cu-fixes
  • build and install the rtl8192cu driver
    sudo dkms install 8192cu/1.11
  • refresh modules list
    sudo depmod -a
  • blacklisted the native kernel
    sudo cp ./rtl8192cu-fixes/blacklist-native-rtl8192.conf /etc/modprobe.d/
  • disable power management
    sudo cp ./rtl8192cu-fixes/8192cu-disable-power-management.conf /etc/modprobe.d/
  • restart your system to use the new driver
    sudo reboot

That's it!

For removal, you can use the following commands.

sudo su

rm /etc/modprobe.d/blacklist-native-rtl8192.conf

rm /etc/modprobe.d/8192cu-disable-power-management.conf

dkms remove 8192cu/1.11 --all

If you're using other Linux distribution, like redhat-based, you may need to modify the above commands slightly.  You have to consult your OS for the appropriated substitute commands.


Technical Support Team
Edimax USA
Santa Clara, CA

/*** EOF ***/
Created:  2016-06-29  10:29 AM
Modified:  2018-03-27  9:51 AM