Created
September 13, 2019 09:34
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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' | |
def replacebytes (edid, pos, thebytes, newlen) | |
bytepos = pos * 2 | |
thelen = thebytes.length | |
if newlen.to_s. != '' | |
thelen = newlen * 2 | |
end | |
edid = edid[0, bytepos] + thebytes + edid[(bytepos + thelen)..-1] | |
return edid | |
end | |
def repairchecksums (edid) | |
blockoffset = 0 | |
bytes = edid.scan(/../).map{|x|Integer("0x#{x}")}.flatten | |
while blockoffset * 2 < edid.length do | |
checksum = (0x100-(bytes[blockoffset,126].reduce(:+) % 256)) % 256 | |
edid = replacebytes(edid, blockoffset + 127, sprintf("%02x", checksum), "") | |
blockoffset += 128 | |
end | |
return edid | |
end | |
def deleteblock (edid, blockoffset) | |
if blockoffset * 2 < edid.length | |
edid = replacebytes(edid, blockoffset, "", 128) | |
edid = replacebytes(edid, 126, sprintf("%02x", Integer(edid[252,2], 16) - 1), "") | |
else | |
puts "Block at #{blockoffset} doesn't exist" | |
end | |
return edid | |
end | |
def deleteblocktype (edid, blocktype) | |
blockoffset = 128 | |
while blockoffset * 2 < edid.length do | |
blocktag=Integer(edid[blockoffset*2, 2], 16) | |
if blocktag == blocktype | |
edid = deleteblock(edid, blockoffset) | |
else | |
blockoffset += 128 | |
end | |
end | |
end | |
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 | |
edid = disp["edid_hex"] | |
edidversion = Float(Integer(edid[0x12 * 2, 2], 16).to_s + "." + Integer(edid[0x13 * 2, 2], 16).to_s) # 1.3 or 1.4 | |
isdigital = Integer(edid[0x14 * 2, 1], 16) > 7 # 0 or 1 | |
puts "edid #{edidversion}" | |
puts "Is Digital #{isdigital}" | |
featuresupportbyte = Integer(edid[0x18 * 2, 2], 16) | |
featuresupport = (featuresupportbyte >> 3) & 3 | |
puts "Featuresupport #{featuresupport}" | |
if edidversion < 1.4 | |
case featuresupport | |
when 0 | |
puts " Monochrome or Grayscale" | |
when 1 | |
puts " RGB color" | |
when 2 | |
puts " Non-RGB color" | |
when 3 | |
puts " Undefined" | |
end | |
else | |
case (isdigital ? "1" : "0") + featuresupport.to_s | |
when "00" | |
puts " Monochrome or Grayscale" | |
when "01" | |
puts " RGB color" | |
when "02" | |
puts " Non-RGB color" | |
when "03" | |
puts " Undefined" | |
when "10" | |
puts " RGB 4:4:4" | |
when "11" | |
puts " RGB 4:4:4 + YCrCb 4:4:4" | |
when "12" | |
puts " RGB 4:4:4 + YCrCb 4:2:2" | |
when "13" | |
puts " RGB 4:4:4 + YCrCb 4:4:4 + YCrCb 4:2:2" | |
end | |
newfeaturesupportbyte = (featuresupportbyte & ~0x18) | (0 << 3) | |
edid = replacebytes(edid, 0x18, sprintf("%02x", newfeaturesupportbyte), "") | |
puts ' changed to "Monochrome or Grayscale"' | |
end | |
blockoffset = 128 | |
while blockoffset * 2 < edid.length do | |
theblock = edid[blockoffset * 2, 254] | |
blocktag = Integer(theblock[0, 2], 16) | |
if blocktag == 2 | |
ctaversion = Integer(theblock[2, 2], 16) | |
if ctaversion > 01 | |
puts "cta-861 extension block with new version #{ctaversion} at #{blockoffset}" | |
yCbCrSupportbyte = Integer(theblock[6, 2], 16) | |
yCbCrSupport = (yCbCrSupportbyte >> 4) & 3 | |
case yCbCrSupport | |
when 0 | |
puts " no yCbCr support" | |
when 1 | |
puts " yCbCr 4:2:2" | |
when 2 | |
puts " yCbCr 4:4:4" | |
when 3 | |
puts " yCbCr 4:4:4, yCbCr 4:2:2" | |
end | |
newyCbCrSupportbyte = (yCbCrSupportbyte & ~0x30) | (0 << 4) | |
edid = replacebytes(edid, blockoffset + 0x03, sprintf("%02x", newyCbCrSupportbyte), "") | |
puts ' changed to "no yCbCr support"' | |
if ctaversion > 02 | |
detailedTimingDescriptorsOffset = Integer(theblock[4, 2], 16) | |
ctadatablockoffset = 4 | |
while ctadatablockoffset < detailedTimingDescriptorsOffset do | |
ctadatablocklength = (Integer(theblock[ctadatablockoffset * 2, 2], 16) & 0x1f) + 1 | |
ctadatablock = theblock[ctadatablockoffset * 2, ctadatablocklength * 2] | |
ctatagcode = (Integer(ctadatablock[0, 2], 16) >> 5) & 0x1f | |
if ctatagcode == 7 | |
ctatagcode = "e" + Integer(ctadatablock[2, 2], 16).to_s | |
end | |
puts "#{ctadatablockoffset}: tag:#{ctatagcode} length:#{ctadatablocklength} block:#{ctadatablock}" | |
case ctatagcode | |
when 3 | |
IEEEOUI = ctadatablock[6, 2] + ctadatablock[4, 2] + ctadatablock[2, 2] | |
puts "Vendor Specific IEEEOUI:" | |
case IEEEOUI | |
when "000c03" | |
puts " HDMI Licensing, LLC -> h14b VSDB" | |
h14bByte = Integer(ctadatablock[12, 2], 16) | |
h14b = (h14bByte >> 3) & 1 | |
case h14b | |
when 0 | |
puts " Support yCbCr 4:4:4 - No" | |
when 1 | |
puts " Support yCbCr 4:4:4 - Yes" | |
end | |
newh14bByte = (h14bByte & ~0x08) | (0 << 3) # 0: No (RGB only), 1: Yes (yCbCr 4:4:4) | |
edid = replacebytes(edid, blockoffset + ctadatablockoffset + 6, sprintf("%02x", newh14bByte), "") | |
puts " changed to No" | |
when "c45dd8" | |
puts " HDMI Forum -> hf-VSDB" | |
hfByte = Integer(ctadatablock[14, 2], 16) | |
hf = (hfByte >> 0) & 7 | |
case hf | |
when 0 | |
puts " 4:2:0 10/12/16 bpc - No" | |
when 1 | |
puts " 4:2:0 10 bpc - Yes" | |
when 2 | |
puts " 4:2:0 12 bpc - Yes" | |
when 3 | |
puts " 4:2:0 10/12 bpc - Yes" | |
when 4 | |
puts " 4:2:0 16 bpc - Yes" | |
when 5 | |
puts " 4:2:0 10/16 bpc - Yes" | |
when 6 | |
puts " 4:2:0 12/16 bpc - Yes" | |
when 7 | |
puts " 4:2:0 10/12/16 bpc - Yes" | |
end | |
newhfByte = (hfByte & ~0x07) | (0 << 0) | |
edid = replacebytes(edid, blockoffset + ctadatablockoffset + 7, sprintf("%02x", newhfByte), "") | |
puts " changed to No" | |
else | |
echo " Unknown OUI" | |
end | |
when "e14" | |
puts "yCbCr 4:2:0 Video Data Block" | |
when "e15" | |
puts "yCbCr 4:2:0 Capability Map Data Block at #{blockoffset+ctadatablockoffset} : #{ctadatablock}" | |
ctadatablock = ctadatablock[0, 4] + ((ctadatablock[4..-1]).gsub! '.' '0') | |
edid = replacebytes(edid, blockoffset + ctadatablockoffset, ctadatablock) | |
puts " Changed to ctadatablock" | |
end | |
ctadatablockoffset += ctadatablocklength | |
end | |
end | |
else | |
puts "cta-861 extension block with old version #{ctaversion} at #{blockoffset}" | |
end | |
else | |
puts "Extension block at #{blockoffset}: type:#{blocktag}" | |
end | |
blockoffset += 128 | |
end | |
edid = repairchecksums(edid) | |
bytes = edid.scan(/../).map{|x|Integer("0x#{x}")}.flatten | |
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 |
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Check out https://github.com/mbruggmann/osx-edid-overrides which is probably the best option for this currently.