control the LCD backlight but not the touch screen

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it is possible control the LCD backlight but keeping active touch screen?
After some time of inactivity LCD turns off with the touch screen, I have to move the mouse or press the keypad to wake it.

I would like after some time of inactivity LCD  backlight turns off but not the touch screen.

thank you
This is because the system enter into the sleep mode. Only mouse and keypad are wake.
You can set the system not go into sleep, and just use the gipo to turn off the back light

Thanks for your answer
system enter into the sleep mode

do you mean that the ENTIRE system go to sleep mode?
so if could  create a watchdog  on the touch screen it would be interesting....

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