HDMI backlight and color distortion in multi-user.target

We have a device with Jetson AGX Xavier SOM and custom carrier board and Jetpack 4.4.1. When we display picture via HDMI in multi-user.target and graphical.target, the result looks different. In the multi-user.target, the backlight becomes too bright and color looks like grey. please refer the links for the results.
My question is that could we adjust the HDMI output brightness in multi-user.target?
Thank you.

Sorry for the late response, is this still an issue to support? Thanks

Yes. It is still an issue and we can’t the way to solve it. Thank you.

I remember this is not adjustable under HDMI situation.

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