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Created November 6, 2020 10:14
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LG 34UC99-W 75HZ Display profile OSX
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34UC99-W-displayprofile.md

Put the contents below in the file /Library/Displays/Contents/Resources/Overrides/DisplayVendorID-1e6d/DisplayProductID-76e4, create the folder/file structure as needed. Requires root permission. Reboot and your display should now have a 75hz option for 3440x1440

<?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">
<dict>
	<key>DisplayProductID</key>
	<integer>30436</integer>
	<key>DisplayProductName</key>
	<string>LG 34UC99 ULTRAWIDE</string>
	<key>DisplayVendorID</key>
	<integer>7789</integer>
	<key>dspc</key>
	<array>
		<data>
		xZtwoNCgKVAwIDoAAAAAAAAe
		</data>
	</array>
</dict>
</plist>

The profile was originally made using SwitchResX and uses the scan rates as provided in the display manual on page 51 (Factory Support Mode).

  • Horizontal adjusted to frequency 110.77 kHz (vertical was auto adjusted)
  • Vertical polarity changed to be positive
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