Under PalmOS, the TX has a problem with what I call "pen up jitter". When you lift up the stylus, sometimes some junk data gets passed on to the app from the digitizer, resulting in a 1/4 inch or greater pen movement at the end of a tap. I am guessing, based on a lot of testing, that this just data is due to the fact that the touchscreen is already being released, but the OS not recognizing this release yet. I tried the October 17 2007 hackndev Opie release on my TX, and found that the pen up jitter is much, much less common.

So, my question: Why? What does the Linux touchscreen driver do right which the PalmOS driver does wrong? I wonder if it would be possible to rewrite the PalmOS driver to fix this.

I don't know the internals of the hackndev project. Where can I find source code for the touchscreen driver?

Best wishes,
Alex Pruss