Can't select HiDPI with DisplayPort

[midriasi]

Hello world, I already thank you for stumbling upon my post!

My specs:

• Samsung G5 Ultrawide 34' (165Hz, 21.5:9)
• 2020 MacBook Pro with MacOS Sonoma
• Belkin USB-C to DisplayPort 1.4 (though I tried other cables as well)

Everything works flawlessly, but for whatever reason, when I try to select the HiDPI resolution, it just ignores it.
The icon in the menu goes blue for a second, and it stays in the default.

The display is huge and there is no way for me to scale the windows in MacOS Sonoma, so I need to increase the text size everywhere manually — which is a pain especially because I then need to revert them when I use the laptop on its own.

Any ideas why? I tried some other tweaks that I found here and there on GitHub (like One Key HiDPI), but nothing. Perhaps I've configured it incorrectly...

[waydabber]

Hi there - is this an Intel MBP? If so, then this is a known bug with the Intel GPU drivers. There is no cure for it I am afraid.

(note: don't forget to configure those DDC features or just click on the banner to make it go away :)).

[midriasi]

Thank you, @waydabber. I really appreciate the swift response & the tip.
This, indeed, is an Intel MBP 😢

I'm guessing there is no workaround to increase the scaling through MacOS Accessibility (or some other command-line magic), right?

I also wonder if this would happen to M1 MacBooks and beyond.
I assume not, since they don't have an Intel GPU?

[waydabber]

This issue is specific to some Intel iGPUs - AMD GPUs or Apple Silicon Macs are not affected.

[zxwdota]

Can you tell me why I'm having this problem with my M1 MacBook and I can't change the resolution?

[midriasi]

Got it — thank you @waydabber