So I have Dell U2515H connected to my Macbook Pro 15" Mid 2014 (integrated graphics) and when I try to run it in 16:9 1280x720 HiDPI (I'm using switchresx) resolution it has no effect. However, when I choose any other 16:10 HiDPI resolution like 1280x800 it works just fine but obviously it cuts the screen. Does anyone know what could be the problem? It is very weird that 16:10 resolutions are OK but 16:9 just don't work, given that native monitor aspect ratio is 16:9.

  • I have the same problem... any news?
    – r1si
    Mar 12, 2016 at 15:14

1 Answer 1


I encountered the very same problem while setting HiDPI mode for my Macbook Pro with SwitchResX. As the HiDPI resolutions didn't fit, I made my own ones.

Here's how it goes:

  • Follow the instructions on SwitchResX's website on how to temporarily disable "System Integrity Protection"
  • On the SwitchResX panel for the DELL screen, go to the "Custom Resolutions" tab and create your desired resolutions under the "Scaled resolution" category.
  • The pixels x lines you scale to are 2 times the "feeling" you want to get, e.g. 3840 x 2160 for a Full HD (1920 x 1080) feeling.

Disabling the SIP made the 720p resolution you mentioned work for me as well.

  • don't work with @Vajs question..., I have the same problem
    – r1si
    Mar 13, 2016 at 17:43
  • @r1si , what exactly doesn't work? This is a solution to the exact same problem. Following these instructions you can create a custom resolution that matches the 16:9 scale, plus disabling SIP makes the bundled 16:9 ones work correctly Mar 14, 2016 at 20:04
  • no... I disable sip , add custom resolution, but nothing see only 3840 x 2160 resolution without HiDPI choose here a video of the problem: youtube.com/watch?v=78X4b-Bfpn8
    – r1si
    Mar 15, 2016 at 14:01

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