Dual-Monitor setup with a single touch screen


I am trying to realize a dual-monitor scenario with a single touch screen.

The proper way seems to be setting up the dual-monitor setup with xrandr and using xinput to configure the touch device to cover the relevant area of the “large” screen. The command line for xinput should be this (in my case):

xinput set-prop "Acer T231H" --type=float "Coordinate Transformation Matrix" 0.5 0 0.5 0 0.9 0 0 0 1 

However, this leaves me with a randomly jumping cursor upon touch (the initial point is correct). The problem seems to be known (see e.g. here https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/774938). Is there a known fix for OpenSUSE?

I have also tried different approaches: configuring the dual monitor as two independent X-Screens, using Xinerama instead of xrandr but with no success.
Are there any other solutions I could try?

Best regards