Xorg 6.9.0 Odd Mouse Wheel Behavior

[Mark Kane]

Hi everyone. I've searched lists archives and Google for this problem, 
but I have not come up with much. Most of the posts I see are about 
mouse wheels not working at all after updating to Xorg 6.9.0 on FreeBSD. 
Mine works and scrolls up and down, but there is odd behavior when 
scrolling UP using the wheel.

After updating to 6.9.0, whenever I move the wheel up it does scroll up 
like it's supposed to, however it also acts like a left mouse button is 
being pressed at the same time. It's somewhat hard to explain but here 
is an example:

I'm going through my inbox in Thunderbird and I start scrolling up using 
the wheel to see messages. In addition to going up the list, it's also 
selecting all the emails that my mouse pointer happens to touch when I 
move the wheel up.

Another example:  I'm in Firefox viewing a website. I take my mouse 
pointer and hover over a link or a bookmark on my bookmarks bar. I keep 
the mouse over it and roll the wheel up once. It selects that link or 
button and goes to it as if I had left clicked on it.

I've tried various suggestions from around the net such as playing with 
xmodmap, trying different values in my xorg.conf, restarting the 
machine, etc.

This problem only has started since upgrading to Xorg 6.9.0 via 
portupgrade on FreeBSD. Here is the mouse portion of my xorg.conf that 
has worked for months up until the upgrade:

----------------
Section "InputDevice"
         Identifier  "Mouse0"
         Driver      "mouse"
         Option      "Protocol" "auto"
         Option      "Device" "/dev/sysmouse"
         Option "Buttons" "5"
         Option "ZAxisMapping" "4 5"
EndSection
----------------

...and an output of xmodmap -pp

----------------
There are 9 pointer buttons defined.

     Physical        Button
      Button          Code
         1              1
         2              2
         3              3
         4              4
         5              5
         6              6
         7              7
         8              8
         9              9
----------------

I don't have any moused flags in my rc.conf. My mouse is a Microsoft 
Intellimouse with left button, right button, left side button, right 
side button, and wheel. I have not had to work with xmodmap any in the 
past since it always worked with the "Buttons" and "ZAxisMapping" in 
xorg.conf, so I'm not sure if that 9 button info is correct.

Thanks in advance for any suggestions.

-Mark
FreeBSD 6.1-PRERELEASE [amd64]

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