I want to keep on backlight of local LCD when I connected to HDMI.

I have STM32MP157C-DK2 evaluation board.

When I connect HDMI to TV, Backlight of LCD off.

I already know that this is because STM32MP1 has only one display controller.

but my custom board is designed to support dual screen (duplicate mode).

So even if connect HDMI to TV, backlight of local LCD still has to keep on.

Can I get some advice about it?

Where is the source code that trun off the backlight of LCD?

Thanks in advance for your answer.

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