Note for users updating RetroArch
---------------------------------

Upstream updated the default option for 'input_driver' setting
(Settings tab --> Driver --> Input Driver) from 'udev' to 'x'. So if
you are updating RetroArch from a previous installation, you may notice
your keyboard unresponsive.

You can either include your user to the input group:

   usermod -a -G input user_name

Or change 'input_driver' entry in the ~/.config/retroarch/retroarch.cfg
from:

   input_driver = "udev"

to:

   input_driver = "x"