Dimming of backlight on MP277 problem

I have run into a problem of dimming the backlight of a MP277 touch panel. I have recently updated my software on the panel with some scripts and new layout of the screen objects but now I can not get the automatic dimming of the backlight to work. I have checked the control panel to see that it is active, but the panel never seem to dim no matter which time I choose. The screensaver doesn't work either. I thought is might be because there was a script running in the background, but even with the script deactivated I can't get it to work.

Is there a way of getting the screen dimmed or the screen saver on. The screen is supposed to be installed for many years and I don't want to repair the screen every year.

Hi
I think that your MPI has lost the Dimming capablity foreverandever !!
But do the OS update and check if it starts working !!

The Update OS doesn't solve anything. Having tried several things it looks like it is a script that is preventing the dimming of the backlight. If I remove the trigger of the script, the dimming works fine. My script runs fairly often, more than once every 5 minute. Does someone know how to make the dimming (or screensaver) work even if there is a script that sometimes run??