QualitySettings.resolutionScalingFixedDPIFactor is not updating

Hello every one,

I am using fixed DPI resolustion of about 250 in the player settings, and I am trying to implement a power saving mode using lower frame rates, lower texture resolution and a lower resolutionScalingFixedDPIFactor,

The problem is that when changing to the lower quality settings, lower texture resolution does apply but resolutionScalingFixedDPIFactor does not apply it changes, and It was tested several times on a mobile phone (android nexus 6P),

It only applies when restarting the game, Also, I have tried changing QualitySettings.resolutionScalingFixedDPIFactor = 0.7 form scripts but got nothing,

Do you have any idea about how to make it work,
Thanks for your time