Display Overrides for macOS (Big Sur)

This repository is for display overrides to make (my) monitors work better on macOS.

For Catalina and older, see catalina-branch.

Goals

• Force HiDPI modes for screens that are not supported (by macOS)
• Force picture modes on misbehaving screens
• Fix displays detected as TVs
• Make sure Night Shift works on external displays
• Allow picking HiDPI modes in Display preferences like for retina displays (less realiant on RDM)
• Custom icons for displays

Usage

1. Create overrides (DisplayVendorID-*/DisplayProductID-*.plist) or use the existing ones
2. Run ./install.sh

Notes

• Since macOS Mojave we no longer seem to need RGB edid overrides, they seem to be ineffective
  • We can use DisplayIsTV => false instead
• Tweak target-default-ppmm to enable selection of HiDPI modes in System Preferences -> Display
  • Also requires adding the appropriate HiDPI resolutions
  • How do we calculate optimal ppmm for display x resolution?
  • See DELL U2715H override for an example

Dumping display EDID

Create a dump for each display connected to your Mac.

n=0; \
ioreg -lw0 | grep "IODisplayEDID" \
    | while read line; do \
        ((n++)); \
        name=display-${n}.edid; \
        sed "/[^<]*</s///" <<<"$line" | xxd -p -r >$name; \
        echo "Created $name"; \
    done

Resources

• Adding/Using HiDPI custom resolutions - tonymacx86.com
• Display Override PropertyList File Parser and Generator with HiDPI support
• edid-decode
• avibrazil/RDM - Easily set Mac Retina display to higher unsupported resolutions
• usr-sse2/RDM - Fork, supports editing, icons, etc.
• xzhih/one-key-hidpi