Debian image and LCD 10" with Touch screen

[spin]

I have get A13-LCD10TS screen. And I am using Debian image from Olimex (rev. 5)
All is working correct after ts_calibrate but, in XFCE, pointer is 5-10 pixel distant from stylus position.

For using this image I must be root. No automount of removable devices and no shutdown in XFCE logout screen if I run X as a "normal" user. Is this correct?

I have also done some test using unofficial Ubuntu image as in

https://www.olimex.com/forum/index.php?topic=2014.0

I have installed Mali drivers, upgraded to Ubuntu 13.10 and to last kernel from sunxi.
With this image screen is flikering and there is no touch screen at all.
But a non root user can automount removable devices and can shutdown system from XFCE or LXDE logout screen.

So, is root the correct user for working on A20-Olinuxino? Or I am forgetting some step?

Regards

Franco Spinelli