I have the same issue with kubuntu 10.04 kernel 2.6.32-24-generic on a Dell 
Latitude E6510 laptop:
"Informations" says "Touchpad Name: Device not found"
No configuration options are available in the System Settings for the touchpad.
My main interest is to disable to touchpad when I have a usb mouse attached 
which is most of the time.  I found that the touch pad driver is psmouse so I 
can unload the driver to disable the touchpad as follows:

sudo rmmod psmouse

This is a work around since I would like to have the touch pad when the 
external usb mouse is removed.  Since the driver is loaded and the touchpad 
works it must be an xorg.conf setting that kde needs to identify the touchpad 
as the psmouse driver.  My KDE detects the touchpad driver as follows: 
(II) config/udev: Adding input device PS/2 Generic Mouse (/dev/input/event15)
(**) PS/2 Generic Mouse: Applying InputClass "evdev pointer catchall"
(**) PS/2 Generic Mouse: always reports core events
(**) PS/2 Generic Mouse: Device: "/dev/input/event15"
(II) PS/2 Generic Mouse: Found 3 mouse buttons
(II) PS/2 Generic Mouse: Found relative axes
(II) PS/2 Generic Mouse: Found x and y relative axes
(II) PS/2 Generic Mouse: Configuring as mouse
(**) PS/2 Generic Mouse: YAxisMapping: buttons 4 and 5
(**) PS/2 Generic Mouse: EmulateWheelButton: 4, EmulateWheelInertia: 10, 
EmulateWheelTimeout: 200
(II) XINPUT: Adding extended input device "PS/2 Generic Mouse" (type: MOUSE)
(II) PS/2 Generic Mouse: initialized for relative axes.
(II) config/udev: Adding input device PS/2 Generic Mouse (/dev/input/mouse2)
(II) No input driver/identifier specified (ignoring)

-- 
Touchpad not configurable in Kubuntu 10.04 B1
https://bugs.launchpad.net/bugs/556019
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