@WBDune Thanks for confirming. A few more questions here:
- Do you encounter the same issue if you switch the HDMI input mode to something other than Game Mode?
- Do you also encounter this issue on other HDR games or blu-ray discs played via the Xbox One X?
- Do you observe this issue if you play HDR content in Vudu, YouTube, or another channel that offers HDR content?
- Have you tried using multiple HDMI ports and cables to connect the Xbox One X to the TV?
We are in the process of rolling out additional updates. Please also try visiting Settings>System>System update>Check now and let me know if updating to the latest release clears up this issue.
This solved the dark HDR problem on my TCL 50S525:
- Play an HDR-enabled movie in an app such as YouTube or Plex, then pause it.
- Press * on your Roku remote and set the Picture Mode to "Normal HDR"
- Scroll down to "Picture Settings" and choose "Reset 'Normal' Settings"
- Open the Roku app on your phone and select the Devices menu at the bottom.
-Click the three-dot menu on the appropriate Roku device (in my case the TCL Roku TV) and choose "Expert Picture Settings."
- Make sure Picture Mode shows "Hdr Normal."
- Under "Gamma" choose 1.8. The change should be immediate on your TV screen.
- Ignore the rest of the options on that screen. You're done with the app.
Hope this helps folks.