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What we are actually doing here is telling the X Server (graphical interface program) what to do with certain mouse commands, which in turn will tell the application you are using how to act with these mouse commands.
Mouse Wheel Motion
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X Server
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Buttons 4 & 5 Events (Explained Below)
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Toolkits / Apps / Config Files
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Scrolling In Apps
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To configure XFree86 to understand that you have a scroll mouse, and how to interpret its commands, you must edit the XF86Config File.
To edit XF86, you must, as root, browse to the /etc/X11 directory. Edit XF86Config with the editor of your choice (we used "gedit" by Right Clicking the Document and choosing Open With > gEdit). Scroll down to the "Core Pointer's InputDevice section" and take note of the current settings, which now need to be removed. You may wish to place a "#" at the beginnings of duplicate lines to "comment out" the lines instead of deleting them (greatly easing the pain of reverting back in case this solution does not entirely work for your system).
Copy and paste the following text into your XF86Config file, remembering to comment or delete duplicate command entries (such as the existing "Option Protocol" directive).
# Option "Protocol" "PS/2"
Option "Protocol" "IMPS/2"
Option "Buttons" "5"
Option "ZAxisMapping" "4 5"
# Mouse-speed setting for PS/2 mouse.
Option "Resolution" "N"
# Option "Protocol" "PS/2"
This is your old "commented out" protocol directive, the one that didn't make your scroll mouse work.
Option "Protocol" "IMPS/2"
The new protocol directive. Stands for I(ntelli)M(ouse)PS/2
Option "Buttons" "5"
Tells X how many buttons your mouse has (check the diagram below). The current version of XFree86 only allows for mice with 5 buttons. Additional buttons may be mapped to keyboard commands (see Further Discussion below).
Option "ZAxisMapping" "4 5"
Maps the buttons to functions
Option "Resolution" "N"
Sets the mouse device resolution, not supported by all mice and OSs
Taken from http://koala.ilog.fr/colas/mouse-wheel-scroll an excellent page for scroll mouse resources:
Q - I want to use the side "thumb" button to something other than button2, or use a mouse with 4 buttons or more
A - Well, This seems difficult, due to the fact that the X protocol only supports 5 buttons and xmodmap do not allow to remap two physical buttons to the same logical value, so I have no solution here. The best way should be (and it would allow to use horizontal wheels too) should be to have the X server modified to send fake keyboard events on wheel events, not button events. Adding this to XFree would be nice.
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