Raspberry Pi – Edimax EW-7811Un Wifi dongle powers down / goes to sleep fix.

Edimax EW-7811Un Power Management

I have several of the tiny Edimax Wifi dongles that I use on my Raspberry Pi’s. If you leave the Pi unattended for awhile, the Edimax will go to sleep and you’ll lose your SSH connection. Here is a fix that worked for me. This is entered on the command line / terminal.

sudo nano /etc/modprobe.d/8192cu.conf

Add the following lines to this file you created. It disables the power down on the Edimax.

options 8192cu rtw_power_mgnt=0 rtw_enusbss=0

Then, do your normal Ctrl-X, Yes and save this file. Reboot. 

Read More