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 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.