Its here, my oh my! Absolutely delighted.
Done a fresh install of W11, updated the firmware and enabled HDR - what else do I need to do to optimise this screen? Ive read about HDR calibration tools, adjusting brightness/contrast etc?
Mines got a new default (I didn't set it) of 15% Brightness and 75% Contrast (it used to default at 25% brightness). I leave it on HDR400 True Black and auto switch to HD1000 when in games.
With the new firmware, my particular screen is rated at 1050 nits apparently before no more improvement. Not bad. But need to calibrate at night (lights off, no ambient sunlight or external city lights) to get every last bit calibrated from this. So if yours doesn't have the newest firmware, update it and then calibrate with blackout curtains covering windows, and no lights on, or do it at night.
There's just the one thing I ran into that gave me a scare (for the entire system, not the display); so it appears that after you update the firmware, do NOT restart your system. Shut it DOWN. And reboot it back up that way. Then calibrate your display or alter settings in roughly that order; with the key thing being Update Firmware -> Shut Down system -> Start up PC again -> then change stuff.
Because when I only restarted without a full shutdown, the system worked. Until when I tried to boot it back up again the next day. Went through all diagnosis issues, but in the end, it was because after turning it to HDR1000 and calibrating it, Windows 11 was throwing a fit (and crashed at the login page or just after trying to log in). Turns out the new HDR profile wasn't accepted properly, and I had to turn the display back to HDR400 True Black (via it's OSD menu rather than through the Dell Display Manager 2.1) before it was able to load in through without issues. Because the system is a Ryzen 7000 series (CPU and GPU) I had thought something might have died overnight. But yeah, looks like there's a rare instance of this being an issue, so users updating be aware.
Update Firmware -> Shut Down system -> Start up PC again -> then change stuff.