Bug HDR output to HDR screen seems borked, need help

Hi there perhaps an HDR wizard can help me..

I recently switched my enviroment to linear but didn't have a HDR screen to test. I have everything set to HDR, so output to HDR screen in player settings, cameras, RTs are HDR (I've checked a few other formats), Post processing and color grading is set to HDR.

yet it looks like this. reference normal at the bottom
help!


HDR render (HDR in windows turned on)


for reference normal render (HDR in windows turned off)

 

I've also had others with HDR screens test this and its universal, so it's not my screen or screen setup.

This also looks like this on a microsoft Series X devkit. HDR worked fine before when I was in an earlier version of unity and/or gamma colorspace

 

i am reading posts on here that say somewhere along the line HDR display output from built-in was removed as a feature?

Is that actually what happened?