Touchscreen troubles

[Petr Štetiar]

Hi,

I'm trying to get working 22" resistive 5-wire touchscreen with USB
controller, it's ET&T TC5UH[1]. I'm using Ubuntu 9.04 with Xorg server 1.6.0,
evdev version 2.3.2 compiled manualy. I've set calibration[1] gathered using
values from kernel printk. It kind of works, but only on half of the screen,
top-lef part:

<crappy-ascii-art>

       [x=284; y=279]      [x=1846; y=230]          [x=3633; y=189]
		 +-----------------+-------------------+
		 |                                .  / |
		 |                           .  /      |
		 |  working part         . /           |
		 |                   . /               |
[x=209; y=1914]  +               . + [x=1352; y=1697]  + [x=2697; y=1212]
		 |           . /                       |
		 |       . /          not working      |
		 |   . /              part             |
		 | /                                   |
		 +-----------------+-------------------+
       [x=165; y=3652]      [x=875; y=3023]        [x=1693; y=2136]

</crappy-ascii-art>

If I touch bottom-right corner I get from kernel driver x=1685, y=2220 and
from xidump x=1785, y=2383 and it seems like almost correct values, but cursor
is moving only in top-left part, near middle of the screen. I tried without
calibration values also, swapping axes, but I can't get it working. For me, it
seems, that the kernel reported and evdev reported values are correct, but
it's then wrongly interpreted somewhere in Xorg code, and pointer doesn't move
correctly.

So my questions are, should I upgrade to latest Xorg, or should evdev version
2.3.2 work in older Xorg version 1.6.0 also? How to debug this? Where should I
look in Xorg code? Did I missed some settings? Thanks a lot.

-- ynezz

1. http://bit.ly/8BVM87
2. Calibration: "153 3666 187 3680"