Touchscreen input jitter

Nuutti Kotivuori naked at
Fri Aug 3 22:55:10 CEST 2007


I have noticed that every time the stylus (or anything else) presses
on the screen, there is a constant jitter or vibration on the pointer
position. It seems to be totally impossible to touch the screen and
not generate any pointer movement. This movement seems to appear
around in a 3x3 pixel box, sometimes around 5x5.

Now, is this normal for touchscreens? I don't see it happening on my
Nokia 770. Is there any way to tune it in software? Or is this just a
local problem on my device.

This is really problematic in practice, since every software that
differentiates between a click and click-and-move (drag) seems to take
every touch to be the latter. One simple example of this is the
included terminal application - when touching the screen, it will
always select something. There is no way to deselect, as every touch
will always be a drag. This also occurs in some scroll-bars - the
scrolling is all jittery since a 3-pixel movement will often induce
scrolling in large lists - and there is no way to get it to keep

-- Naked

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