Mouse-wheel nudge left-right now generates key-presses, not buttons 6+7

[Daniel B. Thurman]

On 03/31/2011 04:58 AM, Neil Bird wrote:
>    Since upgrading to Fedora 14 from 12, I'm seeing my wheel-mouse 
> generating the *key* presses <Left> and <Right> instead of the expected 
> button clicks <button-6> and <button-7>.
>
>    This means that while it still works in, say, Firefox (where <Left> and 
> <Right> scroll the current view), and I can move my caret left and right 
> (!), it won't work anywhere else like it used to (e.g., directory tree views).
>
>
>    Any ideas how I can get the old functionality back?
>
> # xorg.conf snippet
> Section "InputDevice"
>      # generated from data in "/etc/sysconfig/mouse"
>          Identifier  "Mouse0"
>          Driver      "mouse"
>          Option      "Protocol" "IMPS/2"
>          Option      "Device" "/dev/input/mice"
>          Option      "Emulate3Buttons" "no"
>          Option      "ZAxisMapping" "4 5"
> EndSection
>
>
> # /etc/sysconfig/mouse
> FULLNAME="Generic - 3 Button Mouse (PS/2)"
> MOUSETYPE="imps2"
> XEMU3="no"
> XMOUSETYPE="IMPS/2"
> DEVICE=/dev/input/mice
>
I hope this thread is on-topic or at least related?

I am looking at F13 and /etc/sysconfig/mouse and
/etc/X11/xorg.conf does not exist but /etc/X11/xorg.conf.d/
does exist, but only one file: 00-system-setup-keyboard.conf
exist, and there is nothing related to the mouse, AFAIK?

What I am experiencing is, at least with Mozilla's Firefox
& Thunderbird, the mouse thumbwheel is behaving erratically
when scrolling past the "top" of the page or scrolling past
the "bottom" of the page (in FF & TB) and behaves as if the
next/previous buttons were pressed.

Is this related to changeover from the old xinput system
to the evdev system, as Tom Horsley mentioned in his
reply to this post?