same problem here with the Y-axis swap. adding the following code on
line 1165 (right after where the x and y values are read form the serial
pins) fixed that for me:

y = priv->screen_height - y;

problem still is that priv_screen_height doesn't seem to be set to the
right number. the transformations done on the (x, y) coordinates always
give funny results, in particular the wrong scaling results. the pointer
is not drawn underneath my finger, but has a displacement, relative to
the position of my finger (so there's a multiplication = scaling going
wrong).

trying to figure out where this happens...

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no calibration tool
https://bugs.launchpad.net/bugs/227183
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