Please follow below steps to verify and fix the issue:
1. Make sure the video content is encoded with HDR by looking for the HDR description or logo. For example, for YouTube, the video quality setting should indicate “HDR.” For streaming services such as Netflix, the HDR logo will be displayed on the video cover.
2. Check the internet speed and ensure it is fast enough to stream HDR content. For example, for HDR content in 4K resolution, the download speed should be higher than 25 megabits per second.
3. Check the HDR compatibility of source device. The firmware of source device should be updated to the latest version and support HDR and HDCP 2.2.
4. Verify whether the cables support HDR. The cables that come with BenQ HDR monitors are recommended for the best video quality. If an aftermarket cable is used, make sure it fits one the following requirements:HDMI:
- HDMI 1.4 or later versions.
- DisplayPort/DP to MiniDP: DP 1.2 or later versions.
- USB Type C: USB-C certified.