The /etc/X11/XF86Config file tells the X server what kind of
monitor,
video card and mouse you have. You must create it to tell the
server what specific hardware you have.
You'll need info on your hardware:
The recommended way to generate an XF86Config file is to use the
xf86cfg utility. The xf86config text utility is still there
for the (few) cases where xf86cfg can't be used. Also, there is a
sample file installed as /usr/X11R6/lib/X11/XF86Config.eg,
which can be used as a starting point.
For details about the XF86Config file format, refer to the
XF86Config(5) manual page.
Once you've set up a XF86Config file, you can fine tune the video
modes with the xvidtune utility.
XFree86 4.1.0 has support for the mouse driver included in
the new wscons console driver introduced by OpenBSD-current after
2.8. Specify ``wsmouse'' as the protocol and
``/dev/wsmouse0'' as the device in /etc/X11/XF86Config
if you're using OpenBSD-current with a PS/2 mouse.
The OpenBSD pms driver provides both ``raw'' and ``cooked''
(translated) modes. ``raw'' mode does not do protocol translation, so
XFree86 would use the PS/2 protocol for talking to the device
in that mode. ``Cooked'' mode is the old BusMouse translation.
The driver runs in ``raw'' mode when using the /dev/psm0
device name.
See README.mouse for general instruction on mouse configuration in XFree86.