This one seems to have changed again for Kubuntu Karmic Alpha 4.
First the Logitech USB trackball didn't work ... but then I found one
could conigure it via manual editing od xorg.conf (first post in this
thread).
Then manual changes to xorg.conf no longer works, but adding a file
/etc/hal/fdi/policy/mouse-wheel.fdi as described also in this thread
made it work once more.
Now it seems to have broken again after I installed Kubuntu Karmic Alpha
4.
Here are some reports from the console that may shed some light on what
is going on (the config/hal stuff seems to be happening BEFORE XINPUT
adds the trackball device):
# cat /etc/hal/fdi/policy/mouse-wheel.fdi
<?xml version="1.0" encoding="ISO-8859-1"?>
<deviceinfo version="0.2">
<device>
<match key="info.product" string="Logitech USB Trackball">
<merge key="input.x11_options.Buttons" type="string">5</merge>
<merge key="input.x11_options.ButtonMapping" type="string">1 8 3 2
9</merge>
<merge key="input.x11_options.EmulateWheel" type="string">true</merge>
<merge key="input.x11_options.EmulateWheelButton" type="string">8</merge>
<merge key="input.x11_options.EmulateWheelTimeout"
type="string">300</merge>
<merge key="input.x11_options.XAxisMapping" type="string">6 7</merge>
<merge key="input.x11_options.YAxisMapping" type="string">4 5</merge>
<merge key="input.x11_options.ZAxisMapping" type="string">4 5</merge>
<merge key="input.x11_options.Emulate3Buttons" type="string">true</merge>
</match>
</device>
</deviceinfo>
#
# grep Logitech /var/log/Xorg.0.log
(II) config/hal: Adding input device Logitech USB Trackball
(**) Logitech USB Trackball: always reports core events
(**) Logitech USB Trackball: Device: "/dev/input/event4"
(II) Logitech USB Trackball: Found 5 mouse buttons
(II) Logitech USB Trackball: Found x and y relative axes
(II) Logitech USB Trackball: Configuring as mouse
(**) Logitech USB Trackball: YAxisMapping: buttons 4 and 5
(**) Logitech USB Trackball: EmulateWheelButton: 4, EmulateWheelInertia: 10,
EmulateWheelTimeout: 200
(II) XINPUT: Adding extended input device "Logitech USB Trackball" (type: MOUSE)
(**) Logitech USB Trackball: (accel) keeping acceleration scheme 1
(**) Logitech USB Trackball: (accel) filter chain progression: 2.00
(**) Logitech USB Trackball: (accel) filter stage 0: 20.00 ms
(**) Logitech USB Trackball: (accel) set acceleration profile 0
#
--
button mappings wrong with logitech marble mouse
https://bugs.launchpad.net/bugs/313148
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