I have a Kensington Expert Mouse 5.0, which is actually a trackball. Unlike the very latest ones, it does not have a scroll ring. It has 4 buttons which I'll call left, right, top left, and top right. The left and right work as a normal mouse. The other two have no funtion in Linux using the stock mouse parameters. The driver for Windows allows it to be programmed for any of a number of functions for each button. When I used Windows, I had one of the top buttons work as a click-lock and one made the ball work as a scroll wheel would. I thought that there would be a Linux driver out there somewhere but there doesn't appear to be any. I am running Ubuntu Feisty Fawn on a desktop computer, stock kernel, nothing wild or crazy. A friend told me about this list and suggested I try searching the archives first, then post here for some help. I found nothing in the archives so here I am, hoping that someone knows what I'm talking about and can be of some help. I am not afraid to modify the xorg.conf file, which will no doubt be involved in making the upper two buttons do something worthwhile. I've even trashed that file and had to boot to a Knoppix disk to get to where I could restore my backup file. I do want to mention that the typical answer in the Ubuntu forums is not useful at all. It, too, involves a re-write of the mouse section of xorg.conf and does nothing. I have the same functionality with or without the changes. I haven't compiled anything successfully in Ubuntu (yet) but if it takes that, I will learn what I need to in order to get some enhanced features from this trackball. So if there is a driver ou there somewhere and it's not in a .deb package format, I'll do some learning to get it compiled and installed. If it's in RPM format, I can deal with that using Alien. So, can anyone here help me with this?