Comment 17 for bug 368135

using 0.8.8-0ubuntu6.1 with the eGalax touchscreen another fdi is needed:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<deviceinfo version="0.2">
<device>
<match key="info.product" contains="eGalax Inc. USB TouchController">
 <merge key="input.x11_driver" type="string">evtouch</merge>
 <merge key="input.x11_options.ReportingMode" type="string">Raw</merge>
 <merge key="input.x11_options.Emulate3Buttons" type="string">false</merge>
 <merge key="input.x11_options.Emulate3Timeout" type="string">1</merge>
 <merge key="input.x11_options.SendCoreEvents" type="string">On</merge>
 <merge key="input.x11_options.MinX" type="string">0</merge>
 <merge key="input.x11_options.MinY" type="string">2</merge>
 <merge key="input.x11_options.MaxX" type="string">4096</merge>
 <merge key="input.x11_options.MaxY" type="string">4096</merge>
</match>
</device>
</deviceinfo>

using this fdi actually solves the stability issue but it's still slow in reacting to input and the calibration goes away when rotating.
I found the solution here http://swiss.ubuntuforums.org/showthread.php?t=1275975