정답을 찾은것 같긴 한데 좀 옛날것인듯...
 http://kldp.org/HOWTO/html/USB/USB-HOWTO-2.html  아래내용도 참고하면 해결될것 같습니다.
 http://www.xfree86.org/current/mouse4.html#20 http://www.xfree86.org/current/mouse6.html#27  장치이름도 /dev/usbmo
use 이거나 /dev/misc/usbmouse 둘중의 하나일겁니다.
 :
:  /dev/mouse 대신 /dev/psaux 로 적어보시기 바랍니다.
:
: : (**) Option "Protocol" "IMPS/2"
: : (**) Mouse0: Protocol:"IMPS/2"
: : (**) Option "CorePointer"
: : (**) Mouse0: Core Pointer
: : (**) Option "Device" "/dev/mouse"
: : (EE) xf86OpenSerial: Cannot open device /dev/mouse
: : 	No such device.
: : (EE) Mouse0: cannot open input device
: : (EE) PreInit failed for input device "Mouse0"
: : (II) UnloadModule:"mouse"
: : (II) Keyboard "Keyboard0" handled by legacy driver
: : (WW) No core pointer registered
: : No core pointer
: :
: : Fatal server error:
: : failed to initialize core devices
: :
: : When reporting a problem related to a server crash, please send
: : the full server output, not just the last messages.
: : This can be found in the log file "/var/log/XFree86.0.log".
: : Please report problems to xfree86 at xfree86.org. : :
: :
: : startx를 때리자..
: : 이럽니다.. mouseconfig에서 이리저리 잡아 밨지만..
: : 안대네염..
: : 제 마우스는 USB 로지텍 광 휠마우스 입니다..
: :
: : --
: : 고3이당.. 대학 가자~
:
: --
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