打开许久未进入的黑苹果，发现了一件之前没有遇到的事：外接的 Dell 显示器（U2515H）显示的颜色被一片紫色全覆盖着，像是安装了滤镜一样。
网上找到资料说，这是 EDID 未被认可的情况。执行如下 ruby 脚本（来自于 https://gist.githubusercontent.com/adaugherity/7435890/raw/66c54c17b179809b028b58a2ca7af0b9540d05b6/patch-edid.rb），将生成于同目录的 EDID 文件（位于以 DisplayVendorID- 开头的目录下），复制/移动到 /System/Library/Displays/Contents/Resources/Overrides/ 下的同名目录下（如果没有同名目录，那正好连同目录一起搞过去）重启即可。
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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 require 'base64' data=`ioreg -l -d0 -w 0 -r -c AppleDisplay` edids=data.scan(/IODisplayEDID.*?<([a-z0-9]+)>/i).flatten vendorids=data.scan(/DisplayVendorID.*?([0-9]+)/i).flatten productids=data.scan(/DisplayProductID.*?([0-9]+)/i).flatten displays = [] edids.each_with_index do |edid, i| disp = { "edid_hex"=>edid, "vendorid"=>vendorids[i].to_i, "productid"=>productids[i].to_i } displays.push(disp) end # Process all displays if displays.length > 1 puts "Found %d displays! You should only install the override file for the one which" % displays.length puts "is giving you problems.","\n" end displays.each do |disp| # Retrieve monitor model from EDID data monitor_name=[disp["edid_hex"].match(/000000fc00(.*?)0a/){|m|m[1]}.to_s].pack("H*") if monitor_name.empty? monitor_name = "Display" end puts "found display '#{monitor_name}': vendorid #{disp["vendorid"]}, productid #{disp["productid"]}, EDID:\n#{disp["edid_hex"]}" bytes=disp["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" % disp["vendorid"]) rescue nil f = File.open("DisplayVendorID-%x/DisplayProductID-%x" % [disp["vendorid"], disp["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>#{monitor_name} - forced RGB mode (EDID override)</string> <key>IODisplayEDID</key> <data>#{Base64.encode64(bytes.pack('C*'))}</data> <key>DisplayVendorID</key> <integer>#{disp["vendorid"]}</integer> <key>DisplayProductID</key> <integer>#{disp["productid"]}</integer> </dict> </plist>" f.close puts "\n" end # displays.each |