-
-
Save richardjortega/10c3f2f8173b566dacde to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/usr/bin/ruby | |
# Create display override file to force Mac OS X to use RGB mode for Display | |
# see http://embdev.net/topic/284710 | |
# Steps from http://www.ireckon.net/2013/03/force-rgb-mode-in-mac-os-x-to-fix-the-picture-quality-of-an-external-monitor | |
# Steps... (make sure to have laptop lid closed and only one monitor hooked up) | |
# Step 1) $ ruby patch-edid.rb # This will create a new folder inside of the folder this file is ran in, needs to be moved to Step 2 | |
# Step 2) A new folder will be created in your home directory. 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. | |
# Step 3) Restart computer | |
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 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment