I have a LG Ultrawide 34WN650 and a 2017 MacbookPro(Big Sur) with both Radeon Pro 560 4 GB and Intel HD Graphics 630 1536 MB. I have purchased a USB-C to Displayport cable, a USB-C to HDMI cable, QuickRes and SwitchResX.

Do you know how to get HiDIPI 2560x1080 resolution? QuickRes has a HiDIPI 1280 X 540 that does nothing when I click it. 1280 X 540 looks excellent but it is 16:9 not 21:9. I can't use custom resoultions in SwitchResX because they are "Not installed" after save and restart. The video and pictures are excellent in normal 2560x1080, but the fonts are extremely bad.

I have tried:

  • That LG isn't a HiDPI screen, it's an ultrawide "HD" screen.
    – Tetsujin
    Dec 4, 2020 at 15:37
  • It doesn't need to be, it can run HiDPI resolutions, please see that through QuickRes 1280 X 540 looks excellent but it is 16:9 not 21:9 Dec 4, 2020 at 15:54

1 Answer 1


With the help of Stephan Madrau, the creator of SwitchResX I have found a solution for my problem:

  • half of the non HiDPI resolution is the HiDPI resolution, so I am using SCALED 3840 x 1620 non HiDPI --> 1920 x 810 HiDPI. It is a bit big.. but it is looking fresh and crisp.

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