I’ve just discovered that my monitor of the last 2 years (HP X27q) supports HDR 400. Not great, but an improvement over SDR nonetheless, I’d say. Only problem is, when I enable it, the monitor begins to emit a very high pitch whining noise. It’s incredibly quiet, so quiet I didn’t notice it for a few days. But now that I know it’s there, it’s definitely there and I can’t go back to not hearing it. What in the world is going on with the HDR setting?
Not really. HDR probably causes the backlight to operate at a much higher brightness with higher power draw.