After update from MacOS 14.6 to 15.1 - some resolution + HiDPI + refresh rate options are gone/misbehaving

[metaldaniel]

I have MacBook M3 with DELL U2722DE - When I used MacOS 14.6 with 1080p HiDPI 60HZ it introduces flickering in some apps - specifically chrome. This is why I was using 1080p HiDPI 50Hz and everything was fine.

Upgraded to Sequoia 15.1 and the option for 1080p HiDPI 50Hz is gone, if I follow specific steps I can choose this combination but then my screen scales to the default 1440p resolution in a strange way - the screen remains in 1080p but the "canvas" is 1440p - it's like I'm zoomed-in all of a sudden but without being able to move left/right.

[metaldaniel]

Basically HiDPI is breaking when 50hz is set, it used to work just fine.

[waydabber]

Yes, Sequoia changed some things and removed some resolution or refresh rate options. You can try the app's Refresh Rate menu. You can hold SHIFT while opening the menu to force a low-level refresh rate switch, maybe that works.

[B4rt0sz]

I think this is something similar to what I mentioned here: #3638
After Sequoia updated the app has different resolution settings than before.
@waydabber is it possible to revert/give back some resolution or refresh rate options which were removed?

[waydabber]

It depends. In the app's Refresh Rate menu you might see additional refresh rate options for some of the resolutions (in the unexposed section). Try setting the higher resolution in 60Hz first and if it succeeds, check the Refresh Rate list.

[metaldaniel]

I can't set the resolution from the app. The only way this menus gets exposed, is if I change in the Macs display menu to 50Hz, it appears. 

So after changing to 50hz on the Mac, I got to the app and now I can set HiDPI to ON, but when I do - the entire screen scales to 1440P but the view portion remains 1080P.

This is a screenshot of what I can SEE, but the actual screen is much wider and I can move my mouse all the way to the right to take a wide screenshot but that part of the screen is invisible to me.

So I can set what I want, it just doesn't behave right - the desktop scales to the native resolution.