I've selected touchscreen as input device in config and activated the test. I'm holding the stylus (small piece of plastic in my case) inside the yellow box and not moving it. Apart from the small jitter (which is ok i think) the blue pointer in the box jumps left and right every time test goes from "Recording" to "playing". Those jums look random. Each time audio switches it can jump left or right about 10 pixels (not sure about up/down).
Is there some kind of interference from audio codec? or it's just program error somewhere.
And it also helps to know if anyone else has the same bug.
P.S.: i'm trying to improve touchscreen accuracy and have a notable progress, but i'm stuck on this one.