Hi Chase,

What happens is, that if I touch the screen, the cursor does not move from the 
previous position sometimes.
For example when I touch 6 different places on the screen, the cursor would 
follow 3 times and the other 3 not (it would remain at the 3rd position).

Things that effect this: when I press harder on the screen, sometimes the 
cursor does appear on that spot.
When I touch and then drag, the cursor always follows.

Please not that this does not happen on Ubuntu 10.04, so this is related to 
X/evdev.
Besides all this, I have PyMT om my device.
When that is configured to use the mtdev driver, the demo works fine for two 
fingers, meaning while X has trouble following, PyMT shows no trouble.
That would make me think it is not a driver issue, but that is just my point of 
view :).

The other thing is, when I use the driver that does not send the mtY and mtX 
(both) then this issue also does not occur.
So linking all that, I would think that when a touch is performed, some 
mechanism checks if both mtX and mtY are there and if so, tries to determine 
something about a simple touch that couses a different interpretaton to X then 
expected.

Hope this helps :).

-- 
XInput single-touch events aren't always filtered
https://bugs.launchpad.net/bugs/637106
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