The newest demo image for i.MX6 is a gnome release, so it runs with X11.
The startx script that executes at the begining has logic to detect if you are using an lvds, if a touchscreen is detected then ts_calibrate gets executed. The problem arises when you have an HDMI monitor as primary screen and lvds as secondary. Then you will see the calibration tool running in your HDMI monitor and you can't get out of it.
In order to disable/enable the calibration you have to edit the file before creating the sdcard or before booting nfs :
And modify this section.
if [ -L /dev/input/ts0 ]; then
ls /usr/etc | grep pointercal > /dev/null 2>&1
if [ $? = 1 ]; then
Thanks to Guillermo Michel for the tip.