Windows 10: HDR-capable monitor becomes completely unresponsive when switching between SDR and HDR...

I have the Alienware AW3423DW in HDR Peak 1000 mode. Here are the steps to replicate the issue:The relevant system information is as follows:Windows 10 version 21H2Nvidia GPU with GeForce Game Ready Driver version 528.021. Power on computer with HDR already enabled in Windows settings from previous session. The computer will start in SDR mode but will switch to HDR as soon as it reaches the lock screen.2. Launch an application that does not natively support HDR but which runs in exclusive fullscreen e.g. a non-HDR supported game.3. Tab out of the game and switch off HDR in Windows settings.4

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Windows 10 HDR & SDR

Hi i would like to know is it possible in windows 10 to watch a HDR content on a SDR monitor so it looks like a proper SDR content.

Because more and more movies is HDR and on my HDR tv it is all great even in windows playing HDR content AND SDR content on HDR screen works properly. Problem is when playing HDR content on normal pc monitor picture is way to dark contrast is all wrong.
Yea i can fix it in some way in the players with the brightness and gamma sliders but it still doesnt look like the original sdr content.

I would like to fix this issue because soon al my video content will be in HDR but i am not always vieving this on HDR screen. Sometimes i would like to watch it on my phone or my pc or my friends house and in all those places with SDR screens looks way
worse than a normal SDR content.

 

SDR content brightness revert to 0 after monitor HDR status change

I'm currently running windows 11 OS build 22000.282, using Odyssey G9 monitor from Samsung showing as LC49G95T in 'Settings-System-Display-HDR'.

After use HDR option turned on, my monitor blacked for a few seconds, then at the top left corner it shows 'DisplayPort1 (HDR)', then my screen slowly getting dimmer and dimmer (while I'm at desktop and only Settings opened). Changing SDR content brightness slider is indeed working, and I can make SDR content looks as bright as before HDR turned on. But if I try to launch a game doesn't support HDR or Auto HDR, for example Rainbow Six: Siege, my screen blacked few seconds and top left corner says 'DisplayPort1', my game looks normal as in SDR mode.

Then when I close the game, my screen blacked and it goes back to 'DisplayPort1 (HDR)', and slowly getting dimmer and dimmer, the brightness at this point is the same as the SDR content brightness slider in HDR settings moves all the way to 0.

When I check in the settings, the slider keeps at the spot last time I configured, but if I move it a little, the brightness changes to set value. This option is currently broken for me, as every time my monitor goes from non-HDR to HDR, I need to move the SDR content brightness slider again to make it work.

 

Windows 10 HDR & SDR

Hi, jursleglov

If I understand correctly, you want to play HDR content on your PC with an SDR display. This may be possible, but it will depend on the app and probably also on hardware.

The Movies & TV app in Windows can support this on non-HDR laptops that have a sufficiently-bright display. The reason why it is limited to laptops is that there needs to be OS control of brightness settings (not available for external monitors) and some
OS influence of LCD backlight operation (Windows doesn't control the backlight but gives suggestions to the display driver based on the kind of content being shown).