dmig, спасибо!
sudo apt-get install dvb-utils
sudo evtest /dev/input/event6
Input driver version is 1.0.0
Input device ID: bus 0x3 vendor 0x9da product 0x6 version 0x110
Input device name: "A4Tech USB Optical Mouse"
Supported events:
Event type 0 (Reset)
Event code 0 (Reset)
Event code 1 (Key)
Event code 2 (Relative)
Event type 1 (Key)
Event code 272 (LeftBtn)
Event code 273 (RightBtn)
Event code 274 (MiddleBtn)
Event code 275 (SideBtn)
Event code 276 (ExtraBtn)
Event code 277 (ForwardBtn)
Event type 2 (Relative)
Event code 0 (X)
Event code 1 (Y)
[b] Event code 6 (HWheel)[/b]
Event code 8 (Wheel)
Testing ... (interrupt to exit)
Event: time 1204060225.703966, type 2 (Relative), code 6 (HWheel), value 1
Event: time 1204060225.703972, type 0 (Reset), code 0 (Reset), value 0
Event: time 1204060227.111619, type 2 (Relative), code 6 (HWheel), value -1
...
Ура! Нашлась мышка! Как теперь это использовать? Чем генерить событие горизонтального скролла или как передать это в обработчик из xorg.conf?