- Disable “rootless” mode
- 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 the display
- Execute
ruby patch-edid.rb
. - A new folder will be created in your home directory. Move it into the
/System/Library/Displays/Contents/Resources/Overrides
folder. If Finder tells you that you are overwriting an existing folder, consider backing it up first. Restart your computer. The picture quality should be fixed from this point. - Re-enable “rootless” mode
- Reboot. Enjoy your monitor.
-
-
Save eschmar/0e3a94608e024f127fb8 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 | |
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