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Working with a 2020 MacBook Pro 4TB on Sequoia 15.6.

In the past I have edited EDID override plist files to get custom resolutions and HiDPI on external QHD displays.

I have also used BetterDummy/BetterDisplay to achieve this, but that app no longer works with Intel Macs (according to the developer, at least not for getting HiDPI resolutions).

In the past (not sure which macOS version it changed on) you could edit display overrides in /System/Library/Displays/Contents/Resources/Overrides.

It is no longer possible to do this, even with SIP disabled as /System is now read only.

A workaround was to place a custom override in the folder: /Library/Displays/Contents/Resources/Overrides

However, it seems that overrides in this location are no longer read by macOS.

I am trying to get HiDPI (at 1980 x 1080 or 1600 x 900) on DELL P2418D and BENQ PD2500Q QHD displays. Both have worked in this was the past, with modified EDID and/or BetterDummy/BetterDisplay.

Is there any way of forcing EDID override on Intel Macs running Sequoia now? The Override file I'm using

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  • Better display is under active development for macOS 26 Tahoe - are you sure you don’t have a cabling issue? Why do you say the developer has dropped Intel support? Is your software Pro enabled? Commented Aug 5, 2025 at 8:18
  • "Why do you say the developer has dropped Intel support?" - He told me so on his app's forum on Discord. "Are you sure you don’t have a cabling issue?" 100% sure. Same cables that came with the monitors that have been used in the past with HiDPI achieved. "Pro Enabled?" Yes. Commented Aug 5, 2025 at 20:49
  • BTW - With Apple Silicon Macs you now get HiDPI options in the list of available display resolutions. I have M2 MacBook Air and also use M2 Pro Mac mini - on the same QHD displays, resolutions with HiDPI options are available by default. Commented Aug 5, 2025 at 20:57
  • Just to be clear, the problem on Intel Macs seems to be that EDID Override plist files are not being read from /Library/Displays/Contents/Resources/Overrides like they used to be. I can tell this is the case because the display name in my custom EDID is e.g. "DELL P2418 Override" and this does not show in Settings | Displays (which it used to back in the day with Mojave) Commented Aug 5, 2025 at 21:06
  • Note that on M series Macs, EDID Override plist files ARE read and applied from /Library/Displays/Contents/Resources/Overrides. I know this because I have a custom EDID to give me 1920 x 1080 HiDPI which is not offered by default. Commented Aug 5, 2025 at 21:17

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