I know this is an all-time repeating question, but I've read amost all threads that I found and nothing worked out.

Problem:
I have Yoper as my distro and I also own an optical usb wheel mouse. Everything works fine except the wheel. I love the speed and the ease of use.
I've edited the xf86config almost any way you can imagine. Right now my entries are:

Section "InputDevice"
Driver "mouse"
Identifier "Mouse"
Option "Buttons" "7"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "on"
Option "InputFashion" "Mouse"
Option "Name" "Autodetect"
Option "Protocol" "ExplorerPS/2"
Option "ZAxisMapping" "4 5"
EndSection

I've changed "4 5" to "6 7"; "dev/psaux" to "dev/input/mice" or "dev/usb" or "dev/input/mouse[somenumber]"

I would really, and I mean REALLY, appreciate it if someone could help me out.

What model mouse?

It's something like "Typhoon FELIX MOUSE".

Does yoper use XF86Config or XF86Config-4

In the X11 folder there are both XF86Config and XF86Config-4. But XF86Config-4 is a shortcut to XF86Config itself; which ,I think, means they should be the same. Right?!

I edit /etc/X11/XF86Config-4 don't think the other one will change anything.

When I tried, I checked both of them. They both changed in mine.
Do you know what can I do to fix it?

Try this;
Identifier "Mouse"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/mouse"
Option "ZAxisMapping" "4 5"
save the file before you edit by hand!

Guesss what? after all those different alterations, my system couldn't boot up Yoper any more. So I had to reinstall Yoper.
Believe it or not, now it works perfectly.
I really appreciate your help though comprookie2000.
This what it looks like now in my xf86config:

Section "InputDevice"
Driver "mouse"
Identifier "Mouse[1]"
Option "Device" "/dev/mouse"
Option "Emulate3Buttons" "on"
Option "Name" "Autodetection"
Option "Protocol" "explorerps/2"
Option "Vendor" "Sysp"
Option "ZAxisMapping" "4 5"
EndSection

I did all of these yesterday and it didn't work. I don't why.

Glad you got it working!

I just installed Yoper a few hours ago, and I too had a non-functioning mousewheel (optical MS IntelliMouse). After reading this thread, I edited the XF86Config file and added exactly one line:

"Option" "ZAxisMapping" "4 5"

Rebooted, and it worked perfectly. So that line is the only change you need to make. I'm sure the '4 5' values can be tweaked... I guess they'd change the sensitivity or something?

hmm i thought you always hade to use imwheel program to get your mouse wheel to scroll, i have ms intelli explorer and the zmapping would not get my scroll to work i hade to use imwheel everytime i startx with some settings to get it to work, oh well it works ;P