- Download the patch-edid.rb script from the forums thread above and put it in your home directory.
- Restart your Mac.
- Before OS X starts up, hold down Command-R and keep it held down until you see an Apple icon and a progress bar. Release. This boots you into Recovery.
- From the Utilities menu, select Terminal.
- At the prompt type exactly the following and then press Return: csrutil disable
- Terminal should display a message that SIP was disabled.
- From the menu, select Restart.
- Connect only the external monitor(s) in question (I closed my MacBook lid, for example). The script will make override files for any connected monitor.
- Type “ruby patch-edid.rb” in Terminal.
- A new folder will be created in your home directory.
- If You're using a OSX version older than El Capitan, move it into the “/System/Library/Displays/Overrides” folder. If Finder tells you that you are overwriting an existing folder, consider backing it up first.
- Mac OS 10.11 El Capitan does things a little differently. You should use a different overrides folder: /System/Library/Displays/Contents/Resources/Overrides.
- Restart your computer, enjoy your monitor.
Last active
October 3, 2015 01:31
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OSX External Monitor RGB Support
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#!/usr/bin/ruby | |
# Create display override file to force Mac OS X to use RGB mode for Display | |
# see http://embdev.net/topic/284710 | |
# | |
# Update 2013-06-24: added -w0 option to prevent truncated lines | |
require 'base64' | |
data=`ioreg -l -w0 -d0 -r -c AppleDisplay` | |
edid_hex=data.match(/IODisplayEDID.*?<([a-z0-9]+)>/i)[1] | |
vendorid=data.match(/DisplayVendorID.*?([0-9]+)/i)[1].to_i | |
productid=data.match(/DisplayProductID.*?([0-9]+)/i)[1].to_i | |
puts "found display: vendorid #{vendorid}, productid #{productid}, EDID:\n#{edid_hex}" | |
bytes=edid_hex.scan(/../).map{|x|Integer("0x#{x}")}.flatten | |
puts "Setting color support to RGB 4:4:4 only" | |
bytes[24] &= ~(0b11000) | |
puts "Number of extension blocks: #{bytes[126]}" | |
puts "removing extension block" | |
bytes = bytes[0..127] | |
bytes[126] = 0 | |
bytes[127] = (0x100-(bytes[0..126].reduce(:+) % 256)) % 256 | |
puts | |
puts "Recalculated checksum: 0x%x" % bytes[127] | |
puts "new EDID:\n#{bytes.map{|b|"%02X"%b}.join}" | |
Dir.mkdir("DisplayVendorID-%x" % vendorid) rescue nil | |
f = File.open("DisplayVendorID-%x/DisplayProductID-%x" % [vendorid, productid], 'w') | |
f.write '<?xml version="1.0" encoding="UTF-8"?> | |
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> | |
<plist version="1.0">' | |
f.write " | |
<dict> | |
<key>DisplayProductName</key> | |
<string>Display with forced RGB mode (EDID override)</string> | |
<key>IODisplayEDID</key> | |
<data>#{Base64.encode64(bytes.pack('C*'))}</data> | |
<key>DisplayVendorID</key> | |
<integer>#{vendorid}</integer> | |
<key>DisplayProductID</key> | |
<integer>#{productid}</integer> | |
</dict> | |
</plist>" | |
f.close |
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