Hallo forum, I am here for the first time. I hope you all have a good time. Please excuse my english, because I am from Germany and my school time is really long ago.
Well, I have a problem with setting the resolution in game.
I know, my pc has an older graphic card. For WoW, Diablo 3, games, text, photo editing and all the daily tasks my windows is set to 4K resolution and works fine there.
I can play Diablo 4 in 4K, but with extreme slowness, graphic errors etc. This is truly clear, because the grahic card ist to small, too old. Currently I can not buy a better card.
So I want to play in HD 1920x1080.
But I can not set this resolution in game settings, because the setting is greyed and not changeable. I must always set the windows screen resolution to HD before I start Diablo 4. Then Dia 4 plays in HD very fine. After playing I must set the windows screen resolution to 4K again, very annoying – this every time I want to play diablo 4.
Well, this is not an extreme problem, but annoying. Why can’t I set the resolution permanently in Diablo 4? What should I do to keep the game permanently set to HD and running in HD without to change the windows settings before and after gameplay?
Many thanks. 
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Your doing it correctly. Most, if not all new games only run in dx12 fullscreen boarderless mode, as such its not possible to do what you requested. Changing the desktop res is the only way, as you’ve been doing. Annoying? Yup, this is why I’m glad I finally upgraded my gpu, now I just keep it at 4k full time. However, many games do have a resolution scaler option, which I believe d4 does, lowering this simulates lower screen res as well. I’ve had mixed results with these in the past.
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With an underpowered GPU on a high resolution monitor instead of lowering the games rendering resolution ‘directly’ try this:
[Graphics] > scroll down to [Performance]:
We want to lower the “Resolution Percentage” slider.
If it’s unclickable turn “NVIDIA DLSS” below it to “Off”.
With “Resolution Percentage” 50% on a 3840x2160 screen Diablo IV will render the (performance heavy) 3D world in 1920x1080 stretched to fullscreen. However the graphical user interface (mostly irrelevant for performance) will still render at 3840x2160. That is a really good implementation.
A proper native fullscreen mode would still be nice. It did exist in the Beta and was removed for some reason.
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Still no response from Blizzard…