Missing HiDPI resolution listing on a Retina MacBook Pro.

Is there an existing issue for this?

• This is a bug in RetroArch frontend
• I have searched the existing issues

Description

On a Retina display, navigate to Settings > Video > Output then select Screen Resolution and note the resolution list. They are all low-dpi resolutions that are not exposed in System Settings > Display by default. None of the HiDPI Retina resolutions are present.

I was working on a swift script to work around this limitation (only to select alternate refresh rates) and I ran into the same problem. CGDisplayCopyAllDisplayModes returns only lo-DPI resolutions by default. I don’t have any experience with Swift but in my search, I found a way to reveal the correct display modes. Remembering how RetroArch lists display modes, I searched the codebase and it looks like it’s doing the same here and here.

It must be called like so:

CGDisplayCopyAllDisplayModes(
    displayID,
    // HiDPI modes (Retina) ignored without this:
    [kCGDisplayShowDuplicateLowResolutionModes: kCFBooleanTrue!] as CFDictionary
  )

The other problem is video_refresh_rate being set to zero causing the screen to go black after the selection.

Expected behavior

No response

Steps to reproduce the bug

1. navigate to Settings > Video > Output
2. make any selection
3. screen goes black

Version/Commit

1.22.2

Bisect Results

No response

Present in the nightly version

Yes, this is reproduced in the nightly build

Platform & operating system

macOS Tahoe 26.4.1 M1

Affected Cores

No response

Environment information

No response

Relevant log output

Inspect gfx/display_servers/dispserv_apple.m at the display-mode enumeration points around lines 140 and 270, then compare them with the linked Swift example. Reproduce Settings > Video > Output on a Retina Mac and check both the available HiDPI modes and the reported video_refresh_rate. Done means Retina resolutions are listed and selecting one does not leave the screen black.