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I'm trying to enable HDR on Windows 10 on my LG C1 OLED TV, but getting some weird random green flickering pixels. Both my PC and PS4 connects to a 8K HDMI switcher, which in turns connects to the TV via a 50 ft 8k HDMI cable. I suspected the 50 ft cable might be the culprit, but the PS4 has no problems with HDR with this setup. This may be because it's the PS4 slim, which is only 1080p.

This is what the green flickering pixel looks like (not sure how to post mp4s here): https://i.imgur.com/dQWpjAb.mp4

What's also bizarre is that if I leave Windows 10 "Stream HDR video" on, then the preview video of the skateboarder gets really crazy (as shown below). Even if Windows 10 HDR turned off completely, it seems HDR movies still seem to work (since the TV doesn't show washed out colors like my main non-HDR monitor), but the green flickering is still present.

enter image description here

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    Looks like the signal degrades over this high length. Typical troubleshooting would involve eliminating one possible cause after another. Is there any possibility you could use a shorter cable and maybe connect the cable directly without the HDMI switch?
    – mashuptwice
    Commented Dec 21, 2021 at 1:38
  • @mashuptwice Ya, I'm starting to think it's the switch or the shorter cable from the PC to the switch since I connected the 50 ft cable directly from the PC to the TV and it worked fine. I ordered some extra cables and a female-to-female HDMI coupler (both active and passive) and I'll keep troubleshooting it. Thanks!
    – hobbes3
    Commented Dec 21, 2021 at 6:22

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As with most video flickering or aberration issues, it was the overcomplicating setup, specifically the HDMI switcher. When I ran the 50 ft 8k HDMI cable from my PC directly to the TV, everything was fine.

Lesson learned: 4K+ HDMI switchers are janky. I've used them for 1080 before and they worked fine.

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