From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9) Gecko/2008061712 Fedora/3.0-1.fc9 Firefox/3.0

Description of problem:
when evdev is used as mouse driver you can't use the emulatewheel option because it's not implemented.

Version-Release number of selected component (if applicable):
xorg-x11-drv-evdev-2.0.1-1.fc9.i386

How reproducible:
Always


Steps to Reproduce:
1. add an xorg.conf section for your mouse precising you want to use the "mouse" driver and the emulatewheel option
2. restart your xorg server (or the computer)


Actual Results:
the emulatewheel option was noit taken into acount.
the "mouse" driver was not used for the mouse.
the "evdev" driver was used for the mouse.

Expected Results:
first of all the "mouse" driver should have been used instead of "evdev" as precised in the xorg.conf input section.

secondly the "evdev" driver should support the Emulatewheel option to be able toreplace completely the old "mouse" driver.

Additional info:
here is what I added to my xorg.conf to enable the emulatewheel option:

Section "ServerFlags"
        Option "NoAutoAddDevices"
EndSection

then add an input section with the driver "mouse":
Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Device" "/dev/input/mice"
        Option      "Protocol" "explorerPS/2"
        Option      "Buttons"   "5"
        Option      "EmulateInertia" "50"
        Option          "Emulate3Buttons" "on"
        Option          "Emulate3Timeout" "50"
        Option          "EmulateWheel" "on"
        Option          "EmulateWheelTimeout" "200"
        Option          "EmulateWheelButton" "2"
        Option          "XAxisMapping"  "6 7"
        Option          "YAxisMapping"  "4 5"
        Option          "ZAxisMapping" "4 5"
EndSection

and add this input device to your serverlayout section.
Then add any of your devices because it won't be autodetected anymore.

I first reported this bug as a mouse driver issue here:
https://bugzilla.redhat.com/show_bug.cgi?id=446627