In my case using this wifi adater  Wireless N150 Pico USB Adapter – DWA-121: Ubuntu 13+, Kernel 3.8 – 3.9: check this (many thanks to author) For previous kernel versions download the

In case of EDID checksum error during Xorg initialisation, disable this feature modifying your xorg.conf. Example Section “Device” Identifier     “Device0” Driver         “nvidia” VendorName     “NVIDIA Corporation” Option         “IgnoreEDIDChecksum” “DFP” EndSection