XFree86 の設定でホイールマウス対応させます。
"/etc/X11/XF86Config-4" を以下の赤い部分のように変更します。
・・・・・・・・省略・・・・・・・・
Section "InputDevice"
Identifier "Mouse0"
# Modified by mouseconfig
Driver "mouse"
Option "Device" "/dev/mouse"
# Option "Protocol" "PS/2" <---コメントアウトする
Option "Protocol" "IMPS/2"
Option "Emulate3Buttons" "yes"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
Identifier "Mouse9"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "AlwaysCore"
EndSection
・・・・・・・・省略・・・・・・・・