HDR color fades when app goes fullscreen

I can close the app or game completely and the issue goes away. I too have a Samsung KS8000

I have this problem on my Samsung 65" KS9000. I will get a message from the TV that HDR content is playing and then the video goes dull/washed out. The TV video settings themselves haven't changed. If I view the TV menu or open an app on the TV, color
is normal. When I minimize GOW4 or Netflix, the Xbox dashboard is dull and washed out. If I open a non HDR Xbox app like Youtube, colors will go back to normal. Go back into Gears of War 4, Netflix or the Bluray player, video goes bad. Even adjusting in
game brightness/HDR and the TV settings will not help because the color is so bad.

Firebird, yes it's clear there is an attempt at a mode switch because the screen goes dark and re-initializes but like I said the Netflix app then displays very muted colors like its expecting to output HDR but half the color data is missing. If I back out
to the dashboard, the off-color stays. But if I then quit Netflix, the screen display re-initialized and colors are back to normal.

Clearly the Netflix app believes it is in HDR mode because HDR-enabled titles are clearly labeled as such when I have my One S in HDR mode. If I disable HDR, then the Netflix app no longer displays the HDR label on compatible titles. Only 4K UltraHD. So
the app is trying but something is off.

I know others are having a similar issue...there is a Reddit thread about Netflix displaying muted colors on Xbox One S in HDR mode. So it's not just us.

Would be nice to get an official word on this and hear that a fix is coming. I can tell you that Mad Max looks incredible with HDR enabled. I wasn't sure how much of a difference it would make, the the clarity and contrast on the colors is night-and-day
vs HDR turned off. Would be very nice to have Netflix working properly as well.

same issue here. I have a Samsung js8500. The color wash/fade happens with anything that supports HDR. I've called Xbox multiple times but their representatives have no idea. Very frustrating.

I am having this issue both for Netflix and UHD HDR blu rays. I just got a Sony XBR55x850D which
does support HDR. I have properly configured the HDMI ports to pass 4k. Also when checking the TV's capabilities within the Xbox settings, I have green checkmarks for each 4k category.

I will open up Netflix, and the initial white background and red font will show up. Then as the program loads, the HDMI will cut out for a second as I'm assuming the HDR is kicking in (when it shouldn't be) and the colors look faded and and terrible. If
I go back to the dashboard and quit the app, the HDMI cuts out for another second to disengage the HDR and viola, the picture looks great again.

A similar issue is having when trying to watch UHD Blu Rays (Sausage Party). The initial load screens occur, then the HDMI cut out then a faded terrible looking picture. This happened consistently with the player.

The very strange thing is that sometimes the Netflix app will open per normal switch to HDR and look just fine. There is no pattern, just insanely maddening randomness.

If I disable HDR, then there are no issues.

Simply put, HDR on Xbox One S is broken and Microsoft needs to fix it. This is not a TV issue.