“You just haven’t calibrated it!”, “You are just too used to Retina now!”, “You just need to buy a Thunderbolt display!” Apple people also like to solve problems by throwing more money at it. (I realise that owning a Mac makes me an Apple person, too. My lucky break was reading that the current colour space was “YCbCr” when I was browsing the monitor’s settings menu. I was sure that it was using RGB when hooked up to my PC, so I started searching instead for forcing RGB mode in OS X. It didn’t appear to be available out-of-the-box, but I have had some experience in overriding EDID settings for similar purposes so I searched instead for that. Your thread and script was incredibly helpful and informative. It was written to fix problems connecting an external monitor via DisplayPort, but it fixed my HDMI issue just the same. I’ve summarised the required steps below. My last word is to wonder what Apple is playing at. #Switchresx dell p2314h mac os xĭo they just not care about those using third-party components, or are they actively attempting to force people on to Thunderbolt displays? How to force RGB in Mac OS X It seems that this problem has been reported by a lot of people for a long time, and I expect it would require a fairly simple software update. These steps have been updated for Mac OS version 10.11, “El Capitan”. Connect only the external monitor(s) in question, if you can (I closed my MacBook lid, for example).Disable “rootless” mode, you can follow these instructions: How to modify System Integrity Protection in El Capitan.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.See below for differences for previous versions of the system. A new folder will be created in your home directory.The script will make override files for any connected monitor. Move it into the “/System/Library/Displays/Contents/Resources/Overrides” folder. You may have to create the Resources and Overrides folders. If Finder tells you that you are overwriting an existing folder, consider backing it up first. Re-enable “rootless” mode, the instructions are available on the same guide: How to modify System Integrity Protection in El Capitan.The picture quality should be fixed from this point. 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. The overrides folder location is “/System/Library/Displays/Overrides”.You do not need to disable/re-enable rootless mode and perform the subsequent reboots.There are two differences to the steps above: The process is a little more straightforward. I no longer own a Macbook Pro, but if you’re having trouble with any of these steps, please have a look through the comments below (and note that there are multiple pages). Many questions have been answered with helpful tips from others. Update, : In the comments Marcus has proposed a faster method that doesn’t require SIP to be disabled. Others have had success with it so give it a go if you’re uncomfortable with disabling SIP. Update, : A comment from nos1609 below, warns about a bootloop that can occur when running other patches (like the pixel-clock patch) simultaneously, and how to get around it. Update, : According to Peter’s post, you don’t need to disable SIP if you use recovery mode. If others have similar success with this method I’ll update the process. Update, : I have amended this post to target El Capitan. I have taken the steps from bigmcguire’s process, posted in the comments. Although some are still having issues, it appears to be working for people.
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