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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" | |
elsif displays.length == 0 | |
puts "No display data found! Are any external displays connected?" | |
puts "\nNote: Apple Silicon (arm64) devices are currently unsupported, as the standard" | |
puts "method of retrieving display information does not work." | |
end | |
displays.each do |disp| | |
# Retrieve monitor model from EDID display descriptor | |
i = disp["edid_hex"].index('000000fc00') | |
if i.nil? | |
monitor_name = "Display" | |
else | |
# The monitor name is stored in (up to) 13 bytes of text following 00 00 00 fc 00. | |
# If the name is shorter than 13 bytes, it is terminated with a newline (0a) and then padded with spaces. | |
monitor_name = [disp["edid_hex"][i + 10, 26].to_s].pack("H*") | |
monitor_name.rstrip! # remove trailing newline/spaces | |
end | |
puts "Found display '#{monitor_name}': vendor ID=#{disp["vendorid"]} (0x%x), product ID=#{disp["productid"]} (0x%x)" % | |
[disp["vendorid"], disp["productid"]] | |
puts "Raw EDID data:\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 | |
filename = "DisplayVendorID-%x/DisplayProductID-%x" % [disp["vendorid"], disp["productid"]] | |
puts "Output file: #{Dir.pwd}/#{filename}" | |
f = File.open(filename, '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 |
@anbarae What display? Is it HDMI or DisplayPort connection? Try SwitchResX? Run AllRez to get a list of display modes.
Works for Sonoma on a 2016 Macbook Pro 👌
It worked after I used a display port connection.... Thank you!
…On Sun, Oct 15, 2023 at 8:24 AM joevt ***@***.***> wrote:
***@***.**** commented on this gist.
------------------------------
@anbarae <https://github.com/anbarae> What display? Is it HDMI or
DisplayPort connection? Try SwitchResX? Run AllRez to get a list of display
modes.
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I have 2 external HDMI-to-usbc monitors. The override works and I can see it take effect in Settings > Displays, but when i rearrange the monitors in Display settings, one of the monitors gets blurry again. Anyone run into this?
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I have a 4k monitor, using a MacBook Pro 13-inch, 2017, Two Thunderbolt 3 ports. Resolution is maxed out at blurry 1440p. Any way to fix this?