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#!/usr/bin/ruby |
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# Create display override file to force Mac OS X to use RGB mode for Display |
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# see http://embdev.net/topic/284710 |
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# |
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# Update 2013-06-24: added -w0 option to prevent truncated lines |
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require 'base64' |
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data=`ioreg -l -w0 -d0 -r -c AppleDisplay` |
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edid_hex=data.match(/IODisplayEDID.*?<([a-z0-9]+)>/i)[1] |
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vendorid=data.match(/DisplayVendorID.*?([0-9]+)/i)[1].to_i |
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productid=data.match(/DisplayProductID.*?([0-9]+)/i)[1].to_i |
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puts "found display: vendorid #{vendorid}, productid #{productid}, EDID:\n#{edid_hex}" |
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bytes=edid_hex.scan(/../).map{|x|Integer("0x#{x}")}.flatten |
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puts "Setting color support to RGB 4:4:4 only" |
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bytes[24] &= ~(0b11000) |
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puts "Number of extension blocks: #{bytes[126]}" |
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puts "removing extension block" |
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bytes = bytes[0..127] |
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bytes[126] = 0 |
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bytes[127] = (0x100-(bytes[0..126].reduce(:+) % 256)) % 256 |
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puts |
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puts "Recalculated checksum: 0x%x" % bytes[127] |
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puts "new EDID:\n#{bytes.map{|b|"%02X"%b}.join}" |
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Dir.mkdir("DisplayVendorID-%x" % vendorid) rescue nil |
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f = File.open("DisplayVendorID-%x/DisplayProductID-%x" % [vendorid, productid], 'w') |
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f.write '<?xml version="1.0" encoding="UTF-8"?> |
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> |
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<plist version="1.0">' |
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f.write " |
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<dict> |
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<key>DisplayProductName</key> |
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<string>Display with forced RGB mode (EDID override)</string> |
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<key>IODisplayEDID</key> |
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<data>#{Base64.encode64(bytes.pack('C*'))}</data> |
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<key>DisplayVendorID</key> |
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<integer>#{vendorid}</integer> |
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<key>DisplayProductID</key> |
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<integer>#{productid}</integer> |
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</dict> |
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</plist>" |
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f.close |
