Does not list / use HIDPI resolutions

[wackywendell]

On a MacBook with a Retina display, resolutions with hi-dpi are not listed and seemingly not accessible. For example:

$ ./screenresolution list
2014-08-05 15:33:43.994 screenresolution[13007:507] starting screenresolution argv=./screenresolution list
Available Modes on Display 0
   640x 480x32@0        1024x 768x32@0          1440x 900x32@0
   800x 600x32@0        1152x 720x32@0          1650x1050x32@0
   840x 524x32@0        1280x 800x32@0          2048x1280x32@0
  1024x 768x32@0 
$ ./screenresolution get
2014-08-05 15:33:48.503 screenresolution[13010:507] starting screenresolution argv=./screenresolution get
2014-08-05 15:33:48.509 screenresolution[13010:507] Display 0: 1280x800x32@0
$ ./screenresolution set 1280x800x32@0
2014-08-05 15:34:03.217 screenresolution[13012:507] starting screenresolution argv=./screenresolution set 1280x800x32@0
2014-08-05 15:34:03.223 screenresolution[13012:507] set mode on display 0 to 1280x800x32@0
$ ./screenresolution get
2014-08-05 15:34:07.031 screenresolution[13017:507] starting screenresolution argv=./screenresolution get
2014-08-05 15:34:07.037 screenresolution[13017:507] Display 0: 1280x800x32@0

While this may look perfectly fine, the original resolution was 1280x800 with HIDPI, and after the set command, the resolution changed to 1280x800 without HIDPI.

I have some coding experience, and access to such a macbook, so with a little guidance I can probably help in developing / testing any changes.

[dzg]

Yes, please add ability to switch to HiDPI resolutions

[ELLIOTTCABLE]

:+1:

[nigels-com]

I did some hacking of get mode to report the number of pixels in addition to the logical resolution:

$ ./screenresolution get
2016-12-16 11:04:17.871 screenresolution[26642:545489] starting screenresolution argv=./screenresolution get 
2016-12-16 11:04:17.875 screenresolution[26642:545489] Display 0: 1440x900x32@0 [2880x1800 pixels]

The relevant code fragment:

    NSLog(CFSTR("Display %d: %ux%ux%u@%.0f [%ux%u pixels]"),
           displayNum,
           CGDisplayModeGetWidth(currentMode),
           CGDisplayModeGetHeight(currentMode),
           bitDepth(currentMode),
           CGDisplayModeGetRefreshRate(currentMode),
           CGDisplayModeGetPixelWidth(currentMode),
           CGDisplayModeGetPixelHeight(currentMode));

[jjarava]

Hi!

Looking around for a solution to this, I found pull request #21 that, after some "digging", led me to https://github.com/avibrazil/RDM -- which is a project that seems to be based on this, that actually provides a command line utility and a GUI one, and supports Retina displays. It seems to do what I was looking for...

So take this as a FYI

[svenjacobs]

Hello everyone 👋🏼

Unfortunately in the meantime RDM was archived by the owner.

What is currently the best solution to programmatically change display resolutions including support for HiDPI (Retina) resolutions?