Xbox One X not Auto-Detecting TV, thus disabling 4K and HDR

you need hdr for 4k output

Actually, you don't.

Uhd and hdr are required for 4k output

You need UHD, in the sense that you need the TV to support 3840 x 2160 resolution, but you don't need HDR enabled to reach 4K. UHD 4K is the amount of screen resolution available measured in pixels, HDR is the ability of the TV or monitor to display more
natural colours.

Note that the Xbox One S can do HDR in games that support such a feature, but regardless of what resolution you set, all games max out at 1080P internally. If the display is 4K, it will remain in 4K, but games will only be upscaled. Only the Xbox One X
can play Enhanced titles in 4K natively.

You should be able to disable HDR, how you disable it depends entirely on your TV. Disabling HDR via the TV settings should not disable 4K screen resolution. Indeed, some Xbox One games do not support HDR, Fallout 4 on the One X can play in 4K for instance,
but it does not support (or indeed have an option for) HDR.

On my Sony Bravia Android based TV, I had to go to the main settings and enable HDR functionality. Even then, I had to set the HDR setting to 'Auto' on the HDMI port I have my console connected to. If you have HDR set to 'On' all of the time, non HDR games
will display the wrong colours, look oversaturated. With 'Auto' enabled, HDR will only operate when it detects an HDR supported game. This may not be a feature of your display however.

What make and model is your TV?

Hi Nata_Delacroix! My name is Ricardo an independent advisor ready to help you with this situation!

For example, if you can't select the 4K UHD resolution, 4K features aren't supported in the 4K TV details screen, 4K content won't play, or you're seeing video quality problems—try the following suggestions.

Make sure the Xbox is automatically detecting your TV. Go to Profile & system > Settings > General > TV & display options. Under the Advanced column, choose Video fidelity & overscan. In the Display column, ensure that Auto-detect (Recommended) is selected. 4K isn't available when HDMI or DVI is manually selected.

For HDR, check your TV manual to make sure your TV supports the HDR10 media profile. Look for support of BT2020 and HDR or check the list above. (There are two HDR formats: Dolby Vision and HDR10. Your TV can support both, but it must at least support HDR10.)

Make sure your HDMI cable is plugged into the correct port on your TV. Some TVs support their full set of 4K features only on certain ports. Refer to your TV manual or try the different ports on your TV.

Check your TV's settings menu. Your TV might have a special mode that turns on 4K or HDR. Refer to your TV manual to see if you must change your TV's settings. Again, your TV manufacturer may use different names for HDR—see the list above.

If some content won't play. Make sure your TV supports HDCP 2.2 and that it's turned on in your TV's settings.

Check your HDMI cables. Make sure you're using the HDMI cable that came with your Xbox.

If a device is plugged in between your TV and Xbox. Remove the device and plug your TV directly into your console with the HDMI cable that came with it. Some AV receivers or other video equipment may interfere with the data passed between console and TV. Your device must support the same capabilities as your TV, either directly or pass-through.

Make sure your TV and AV receiver firmware are up to date. Many newer TVs and devices can take updates over your home network. If you find that it doesn't support some 4K or HDR features, a TV or receiver firmware update may resolve the problem. Check your TV or device manual to see how to update the firmware.

Turn off native 4K playback. If you're seeing a blank screen or errors while trying to play 4K content and you've tried all previous steps, turn off native 4K playback and try to play the content in a lower resolution. Go to Profile & system > Settings > General > TV & display options. Under the Advanced column, choose Video modes and uncheck the option to Allow 4K.

If you're seeing strange colors while playing HDR content. If you've tried all previous steps, go to Profile & system > Settings > General > TV & display options. Under the Advanced column, choose Video modes and uncheck the option to Allow HDR10.

If that doesn’t fix it, turn HDR10 back on. Then uncheck Allow Dolby Vision and see if that fixes it.

Hi, still having this problem. Had already tried every you said to try, Ricardo. Auto-Detect seems to be the problem here rather than the solution though. When manually selecting what connection I have, I can run the One X in up to 1440p. When using Auto-Detect, I am stuck in 640x480 resolution, with no way out of it other than to put back into manual selection mode. Other consoles work fine, I have tried using the Xbox's original HDMI cable as well as a HDMI 2.1 cable. Nothing seems to be working, and the problem definitely seems to be with the Xbox One X.

Yes absolutely it does, Your Xbox will auto-detect the type of Tv you have and setup default setting. To get the best display from your Xbox One X you will want to use a 4K capable TV with HDR.

Amazon had Scorpio’s this morning, you have to click the Xbox one X and then change the “size”. So they are still out there. My 1-X will not display 4k on my Visio TV even though it detects the TV having 4k with HDR 10.