Excerpts from /etc/X11/xorg.conf

Section "ServerLayout"
Identifier "XFree86 Configured"
Screen 0 "Screen0" 0 0

# Since evdev, manual keyboard/mice entries are mostly ignored:
# Keyboard auto-probed

# Touchpad auto-probed
# USB mouse auto-probed
# Serial Mouse auto-probed
### AIGLX for compiz 3D-Support with DRI & Composite
### This option doesn't hurt even if it's not supported by the individual card
Option "AIGLX" "true"

EndSection

Section "ServerFlags"
Option "AllowMouseOpenFail" "true"
Option "DPMS" "true"

EndSection