Mouse wheel not working in unstable

[J.S.Sahambi]

I installed Debian/unstable on a new machine which has optical Microsoft 
Intellimose with usb interface. The usb connector of the mouse is 
connected to the ps2 style connector of the PC with a usb-ps2 converter.

The mosue is working but the scrolling is not working in any 
application. Can anybody give some hints?
thanks
JSS

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