I have a Logitech wheel mouse (model C48), PS2, to an IBM TP T20 with
XP Home.  Logitech driver file mw9791enu.exe has been installed.  Why
does the wheel not scroll in Word, or in Windows Explorer?

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Request for Question Clarification by sublime1-ga on 21 Apr 2004 15:19 PDT

mesaman...

Does it scroll in other documents? Do you have a Logitech
Mouse icon in your Control Panel? Go to Start -> Settings
-> Control Panel to see. Are the settings under the dialog
resulting from clicking on the Logitech Mouse icon set
to allow scrolling for the middle wheel?

If you have a Logitech Mouse icon, this indicates that the
Logitech driver is loaded and being used. If you have a 
plain 'Mouse' icon, you may be using the Microsoft driver
default driver, which is okay. That's what I use with my
Logitech mouse, and the scroll wheel works fine.

If you click on the plain Mouse icon in Control Panel,
go to the Hardware tab, and click on Properties at the 
bottom. Then click on the Advanced Settings tab on the
resulting box. Make sure that 'Wheel Detection' has the
drop-down dialog set to 'Assume wheel is present'.

Let me know the answers to these questions, and where 
this takes you...

sublime1-ga

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Clarification of Question by mesaman-ga on 22 Apr 2004 21:01 PDT

Many thanks to sublime1 and aht:  The solution required the BIOS
setting to be changed, and the "assume wheel" thing.  It is working!

On the IBM T2x series, the PS/2 port is tied to the Trackpoint (that
red knob in the middle of your keyboard). Whenever the Trackpoint (and
its driver) are enabled, it controls the PS/2 port instead of any
other mouse driver. The Trackpoint driver does not support wheel mice.

If you wish to use your mouse's wheel, you will need to disable the
Trackpoint, and replace its driver with the Logitech driver (right
now, I am 99% sure you simply have both drivers installed).

An alternative is to acquire a USB mouse; USB mice are supported as a
second pointing device, and will not be controlled by the Trackpoint's
driver. This allows the secondary driver, such as the Logitech driver,
to take over and enable the wheel.

If you can provide my colleague, sublime1, with the answers to his
request for clarification regarding your Logitech driver settings, and
if in addition you can check to see whether it is the IBM Trackpoint
driver, or the Logitech driver, that appears in Control Panel>Mouse,
then sublime1 or myself can help you resolve this situation.

Regards,

aht-ga
Google Answers Researcher

Please note that there is one BIOS configuration setting for the T2x
series to automatically disable the Trackpoint when an external mouse
is detected on the PS/2 port during bootup. This setting, when used
with the latest BIOS firmware version, will allow you to continue
using the Trackpoint when you boot up without an external mouse, while
allowing your external mouse's driver to take over when you boot up
with it installed. Note that this only occurs at bootup, so if you
need to unplug the external mouse during a session, you will need to
power down first. It is actually highly recommended not to plug or
unplug PS/2 devices (keyboard or mouse) while a computer is turned on,
anyway.

Regards,

aht-ga
Google Answers Researcher