Switchresx sierra code#
sudo defaults write /Library/Preferences/ multiRefreshRateScaledModes -bool trueĮach scaled resolution (and its corresponding HiDPI resolution) will then have all the timings that the scaled resolutions base has.įor older macOS versions, I guess you'll need code to create scaled resolutions with specific timings, and patches to CoreDisplay to allow them. Close SwitchResX and save when prompted.fter following these steps, you should be able to adjust the resolution of your external monitor through the 'Display' window in System Preferences. Thought I should share in case anyone has the same issue I did. MacOS 10.14.6 has a new hidden preference to enable multiple refresh rates for scaled resolutions (including HiDPI resolutions). I was using SwitchResX to display 2560 x 1080 on High Sierra without issue. SwitchResX can let you to create new resolutions or customize existing. This is why 3840x2160 30Hz is chosen for the timing. MacOS Big Sur & High Sierra: Hold down the Option key and click on Scaled option. I think the timing used for the base resolution is the last built-in timing having the same resolution as the scaled resolutions base. By default, scaled resolutions are created with only one refresh rate/timing. This means macOS draws into a frame buffer that is 5120x2880 and the graphics card scales the frame buffer to the scaled resolutions base which is 3840x2160 in your case (SwitchResX can change the scaled resolutions base). In this tutorial, we are going to go over the 'General Settings', which is the second option on the left-hand side menu. You can force RGB by overriding the EDID (limits you to 8bpc)ĭisplayPort 1.2 is preferred because it has slightly more bandwidth and will allow RGB 10bpc without requiring HiDPI uses a scaled resolution of 5120x2880. In this tutorial, we are continuing our instructional series on using the SwitchResX application on your Mac, running OS X Yosemite, to switch to true HD or other screen resolutions. HDMI 2.0 4K60Hz might use chroma subsampling (YCbCr422 10bpc)
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