M4 Pro isn't able to set the same custom resolution (3424 x 1926, HiDPi) as my M1 Pro

[taninke]

I've just recently upgraded to a M4 Pro, and noticed I cannot set the same settings I previously had on my M1 Pro for scaling.

The M1 Pro had 3424 x 1926 HiDPi at all available refresh rates (VRR, 120, 144, etc).

Currently on My M4 Pro with the same exact settings, I can do native resolution of 3840 x 2160, or the next HiDPi of 3360 x 1890.

Everything between that has disappeared.

This is what it looks like on the new MBP M4:

Compared to my M1 Pro:

Both using the same DisplayPort to USB-C cable, running MacOS 15.2, tested on DP 1.4 and 1.4 DCC

[waydabber]

Yes, the M4/M4 Pro seems to behave in a more limited manner. See these forums about it but there are many posts on Reddit too. Hopefully Apple will improve this.

https://forums.macrumors.com/threads/5k2k-at-120hz-with-mac-mini-m4.2441289/unread
https://forums.macrumors.com/threads/for-lg-oled-users-mac-mini-m4-does-not-support-hidpi-4k-over-hdmi-2-1.2442797/

[taninke]

Well that's heartbreaking, but good to know! Thank you

[Goodgrapes]

Try creating a Virtual Screen with your desired Resolution.

Then go to System Settings > Displays and replicate as such:

This allow me to dial in my LG 5k/2k Ultrawide with a sharp image just like I have on my M1 MacBook Pro.

[taninke]

Thanks!

I just got off the phone with Apple support and they escalated a ticket to engineering, so hopefully it gets resolved.

I'll try this as a work around, only downside is having to use 60hz vs 144/120 but that's better than nothing. Thanks!