We are revisiting this problem and I wonder if anyone has any new thoughts.

We have a openSUSE 13.1 and KDE 4.13.2
The PC has a Nvidia card with a HD monitor as screen 0 connected via the DVI
and screen 1 connected to a touch screen HD monitor via the HDMI. They are
set up as extended, that is, screen 1 is to the right of screen 0.

Most stuff works fine in that you can drag apps off screen 0 and onto screen 1
by moving it to the right. The mouse cursor moves correctly between the screens.

What doesn't work properly is the touch. If you touch the touch screen on the right
the cursor lines up perfectly but as you move your finger to the left the cursor moves
at twice the distance of your finger so by the time you have got to the left of the touch
screen the cursor is all the way over to the left of screen 0. It seems as if the touch has
a different view of the geometry than the mouse.

Ta

Mal

Just to be certain - the touch screen is operating as if it covers both monitors?

Yes,

both screens are the same resolution to make it easier

So putting your finger on the touch screen on the far right
the cursor jumps to underneath your finger as expected

Then for every pixel you move your finger to the left the cursor
moves 2 so by the time your finger is half way across the
touch screen the cursor has made it to the far left of the touch
By the time you have got to the far left of the touch screen the
cursor is right over on the left of the non touch screen

Vertically is correct BTW

Regards

Mal

First and most important question is which driver is used for the touchevents.
The input is just not mapped "as expected" (that's not even necessarily a bug - you want to be able to reach the other screen w/ the pointer, do you?)
This can usually be configured in the driver -> the driver in use is important. (in doubt: "xinput" output)

For the most simple case:
https://wiki.archlinux.org/index.php/to ... head_setup

If you're using eg. the prop. egalax driver, it comes with a config tool.

Easy when you know how

Works perfectly, many thanks

Mal

yeah! perfect! thanks!