After trying a few, and rebooting, the picture below was the outcome, so it looks like 53Hz is the max my setup can run with, but it looks great, so I'm not complaining. I kept seeing "Not Activated - in." for my status after saving and rebooting, and it took a while to figure it out, but that just meant "Not Activated - invalid," meaning that the custom resolution wasn't a valid one. I had to try a few different values for the Hz before seeing that it actually could only handle 53Hz. After disabling SIP, and going through the other steps on here, I realized that the actual issue was that my mid-2012 MacBook Pro connected to an LG 34UM68-P 34-Inch 21:9 UltraWide via Mini DisplayPort to HDMI didn't actually support 2560 X 1080 60Hz. I started having my issue after upgrading to Mojave, and I've had black banding on the side of my monitor for like two weeks now. Just fixed my issue thanks to some of the help I found on here in conjunction with this page of the FAQs from SwitchResX. Close SwitchResX and save when prompted.Īfter following these steps, you should be able to adjust the resolution of your external monitor through the 'Display' window in System Preferences.Adjust the settings to match the appropriate PNG provided in this gist.Add a new custom resolution be clicking the + symbol at the bottom of the window.After launching SwitchResX, select the external monitor from the list on the left.Once in recovery mode, open a terminal window.Boot into the recovery partition by pressing CMD + R when starting up your Mac.If you are running OSX 10.11 or higher, SIP must be disabled. #Disabling System Integrity Protection (SIP) For more information, including download links, vist. SwitchResX is a utility that allows users to override the default resolution settings in OSX. #SwitchResX Settings for LG 21:9 UltraWide
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