Custom Resolution Missing

[seanhealy]

Hi, I recently tried to switch from using a Dummy to the new-ish custom resolutions.

Using a Dummy I'm able to set my resolution to 3968x1674 for example. However when enabling custom resolutions the max it seems to allow me to set is 3840x1620 despite having added the 3968x1674 resolution manually as a custom resolution.

Potentially related to this as well, I also tried to set a custom range for the smooth resolution scaling but the menu is still showing me options outside of the specified range.

Custom Resolution Setup

Desired Resolution Showing for Dummy

Desired Resolution Absent on Display

[waydabber]

Hi there - it seems you are using an M1 mac that has a Pro (or Max/Ultra) chip inside. These support a max. HiDPI width of 3840 (7680 pixels). This is a problem especially for 5K ultrawide users as there is a gap between 4K and 5K horizontal resolutions (5K being available as LoDPI only).

See this for more info: #735

For the time being if you want HiDPI resolutions with width exceeding 3840, you have to use the dummy mirroring approach (with all its shortcomings).