Is it possible to turn off/dim the backlight on orangepi GPIO lcd ?

Hi,

I'm using raspberrypi ili9488 GPIO LCD (Image here) and I was able to make it working with notro's fbtft drivers and it works fine.

What I am trying to do now is to control the backlight or just turn it on and off inside my application with a linux command or for example by turning on and off a GPIO pin but I was not successful.

Turning on a off the +5v and +3.3v did turn the whole lcd of and when I turned it back on it did not work and I had to restart the system.

I managed to control the backlight by using a transistor on the lcd board backlight power pin but it was not so practical as it needed a lot of time and what we do is producing more than 1000 product each time and it need a lot of time and human resource so this is not what we want.

Is ther anyway to control or just turn on and off the hat (gpio) lcd screen by using linux commands or by using any fbtft (notro) command in the driver or just by just do LOW or HIGH any gpio pin on orangepi ?

Thanks in advance.