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I am using a 5 inch HDMI screen on a RPI 3 which will just turn blue when screen blanking is active. My idea is to switch it off when screen blanking gets activated using a GPIO and a FET. I am able to write some code to do that. Is there a way to trigger that script on screen blanking and again when the screen is supposed to be turned on.
The screen blanking state appears in a /sys/class/... file. The specific file can be found in /etc/venus/blank_display_device.
You could write a service that reads the /sys/class file periodically and sets the GPIO based on it's value (0 for screen on or 1 screen off).
