Some users might be aware that there has been a great fix using a Ruby script to create a new EDID for your display. This is to fix an issue with some displays and Mac OS whereby it sees the display as a TV screen and is not using RGB mode for it, resulting in a very bad display quality (washed out, fuzzy, pixelated, etc).
The 'old' trick with using the Ruby script and placing the files in .../System/Library/Displays/Contents/Resources/Overrides/ doesn't work any longer, even with SIP disabled as the file system is now mounted read-only. You can mount it read-write but that's a very long-winded and potentially lethal solution.
The easy fix:
I hope this helps anyone with this problem.
The 'old' trick with using the Ruby script and placing the files in .../System/Library/Displays/Contents/Resources/Overrides/ doesn't work any longer, even with SIP disabled as the file system is now mounted read-only. You can mount it read-write but that's a very long-winded and potentially lethal solution.
The easy fix:
- download the ruby script: https://gist.github.com/adaugherity/7435890
- in terminal, run the script with 'ruby' followed by the script location/name
- it will create a folder in your home directory (something like 'DisplayVendorID-XXXX...)
- in /Library/ create following new folders: Displays/Contents/Resources/Overrides/
- copy the whole folder from step 3 (located in your home folder) to the Overrides folder you created in step 4
- reboot
I hope this helps anyone with this problem.