Hardware Display- Samsung KS8000 AV Receiver- Yamaha RX-V381 GPU- GTX 1080 TI At 4k resolution (3840 x 2160) and 60Hz refresh rate, I am unable to change any color settings in the Nvidia Control Panel. The only options available are Desktop color depth: Highest (32-bit) Output color depth: 8 bpc Output color format: YCbCr420 Output dynamic range: Limited If I set the refresh rate to 30Hz, I am able to select more color options. Any idea why at 4k x 2k, 3840 x 2160 and 60Hz I am unable to access more color settings? Using a new 18gbs HDMI cable, I've tried every port on the TV, set the TV input to 'PC' and went directly from the GPU to the TV (circumventing the AVR), still only YCbCr420 and the settings listed above.
I also have problems with my KS7005 (which is equivalent to your model). Like you I cannot change any settings in 4K/60Hz mode but I've not tried the 30Hz mode. Another thing I cannot do is enable UHD Color Mode on my TV for the PC HDMI channel since the computer doesn't accept it. My monitor blinks, turns itself off, then on again, blinks and off a couple of times before it turns off completely. After that it doesn't matter if I even turn off the TV, my monitor won't turn itself off until I disable UHD Color Mode. My cable is 15m long (it does have a build in repeater) so I thought I'd try connecting the computer to the HDMI cable that came with my PS4 Pro. This actually helped since I could now have UHD Color enabled. Unfortunately I didn't try tinkering with color settings. How long is your cable?
https://www.amazon.com/gp/product/B01H7M6YKI/ 6ft GPU to AVR, 6ft AVR to TV. I haven't had any issues turning UHD Color Mode to On. Via the TV Settings - Picture - Expert Settings - HDMI UHD Color I just set them to all on, no issues there.
I have a KS8000 that was connected to my gtx 1070... Great TV. Ensure your HDMI cable is capable of 18gb bandwidth / certified HDMI 2.0 (some cert. cables are trash). Your Samsung is updated. That you are using no adapters between TV and GPU...until you fix your issue. Of course UHD color mode on. Note...PC mode is the only way to get low input RGB 4.4.4. You can select it with game mode but, the TV will display 4.2.2. Have all control panel settings as default...no CRU,DSR or custom EDID profiles. If the setting still does not show, I would try reinstalling nvidia driver or at least checking your monitor information is listed correctly. I ran direct HDMI for over a year with few issues. It would receive 4K and even 1440p, managed a crisp picture considering its a TV. Only issue I had was HDR
Thanks for the response. https://www.amazon.com/gp/product/B01H7M6YKI/ These are the cables in use. They are both 18gb bandwidth and HDMI 2.0 Samsung is updated to the latest firmware. UHD color mode on. I set up a CRU profile to disable the 4096x2160 resolution a couple months ago, don't remember it super vividly. Could that have something to do with it?
Any updates? Sorry this is the first I've visited since saturday. How long has it been since your last driver update for your gpu? Also how long since you did a clean install after using DDU (display driver uninstaller) You might even want to consider using ccleaner to straighten up your registry. Sometimes a bad CPU or Ram OC can corrupt boot info.
I have the same TV set as you , Samsung KS8000 65". Have you tried changing the name of the input HDMI on the tv settings menu ? Example instead of PC go and change it to HDMI 3 in edit options , might worth a try as that is what i have to do to have all the menu options available. Let me know if this trick helps. Kind regards: Chispy