EHU,

I have a MS optical mouse (usb) running on Slackware 9.1 no problems. Hopefully slack should autodetect your mouse when you reboot with it attached and to get everything running properly, the wheel etc ... you need to tweak the "InputDevice" section for the mouse in the /etc/X11/XF86Config file.

Mine looks like this;

# Identifier and driver

Driver "mouse"
Identifier "Mouse"
Option "ButtonNumber" "7"
Option "Device" "/dev/mouse"
Option "Name" "AutoDetected"
Option "Protocol" "imps/2"
Option "Resolution" "120"
Option "Vendor" "AutoDetected"
Option "ZAxisMapping" "4 5"

You may have to have a look through the /etc/rc.d/rc.modules file and uncomment the line that corresponds to your mouse if its not autodetected.

Hope this has you heading in the right direction - it took a bit of tweaking to get mine running the way I wanted it to.

This probably have been posted in the Hardware forum, but never mind - good luck.

This link is 12 months old but should help also, http://www.xfree86.org/current/mouse.html