Toggle mouse support in GNU/Linux consoles (GPM Mouse mode).
With a prefix argument ARG, enable GPM Mouse mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
the mode if ARG is omitted or nil.
This allows the use of the mouse when operating on a GNU/Linux console,
in the same way as you can use the mouse under X11.
It relies on the `gpm' daemon being activated. (fn &optional ARG)
Non-nil if Gpm-Mouse mode is enabled.
See the command `gpm-mouse-mode' for a description of this minor mode.
Setting this variable directly does not take effect;
either customize it (see the info node `Easy Customization')
or call the function `gpm-mouse-mode'.