I also had the same information in system report, if you want to correct this as I have already done then have a look at the link below:
http://www.ireckon.net/2013/03/forc...-quality-of-an-external-monitor#comment-14684
View attachment 598573
How to force RGB in Mac OS X
These steps have been updated for Mac OS version 10.11, “El Capitan”. See below for differences for previous versions of the system.
1. Download the patch-edid.rb script from the forums thread above, or download
Andrew Daugherity’s improved patch-edid.rb script
from his github page. Put the script in your home directory.
2. Disable “rootless” mode:
Restart your Mac.
- Boot you into Recovery mode
- Before OS X starts up, hold down Command-R and keep it held down until you see an Apple icon and a progress bar. Utilities menu, \
- Terminal and type: csrutil disable
3. Reboot.
4. Connect only the external monitor(s) in question, if you can (I closed my MacBook lid, for example). The script will make override files for any connected monitor.
5. Type “ruby patch-edid.rb” in Terminal.
6. A new folder will be created in your home directory. Move it into the
“/System/Library/Displays/Contents/Resources/Overrides”
7. folder. If Finder tells you that you are overwriting an existing folder, consider backing it up first.
8. Restart your computer. The picture quality should be fixed from this point.
10. Re-enable “rootless” mode, the instructions are available on the same guide:
How to modify System Integrity Protection in El Capitan
Terminal and type: csrutil enable
11. Reboot. Enjoy your monitor.
To undo the changes, either delete the folder you had copied to the Overrides folder (if it didn’t already exist) or replace it with the folder you had backed up. You will need to re-enable rootless mode to do this.
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