HiDPI on external monitor on late '12 15" rMBP?

[MaxLt]

I spent a lot of time searching for the answer but could not get it. I have a 4K monitor connected to a 15" rMBP from late 2012 with Mavericks. Display works fine at it's native resolution at 30Hz, but everything is too tiny. How do I make it HiDPI? I see only non-HDPI resolutions in display options.

 

[MaxLt]

Bump. Anyone? why does Apple make things so difficult???

 

[Wuiffi]

According to anandtechs nMP review

You can use tools like SwitchResX (or Quartz Debug or the necessary Terminal command) to enable a 1080p HiDPI mode

 

[MaxLt]

According to anandtechs nMP review

I have not seen a definitive example of anyone doing it successfully, and it does not work for me. The mode is in the list in SwitchResX (with "!" sign), but when I select it, nothing happens. So I can do the full resolution of the monitor, with everything being small, but I cannot do HiDPI. I can also do HiDPI well with this monitor on my wife's Windows 8.1 laptop. I tried SwitchResX, QuartzDebug, ResolutionTab etc - nothing works. I'm either not getting the mode switched at all, or the monitor shuts off when I make the switch. Maybe Mavericks changed something?

 

[unphased]

Yep, I'm in the same boat, I now have two external monitor setups that are failing to function properly on Mavericks with the rMBP 15" mid 2012. It's particularly frustrating because it is a big selling point of Mavericks that it addressed the hobbled multi-monitor support in ML, but it seems like it was one step forward, and one step back.

I really wish I had given the HiDPI a try back when I was still on ML.

It basically just does nothing when you try to switch to certain HiDPI modes. In particular, the one that we care about, which is the one at half the native res. This yields the best image quality most of the time. Most of the much lower HiDPI modes work just fine.

I really hope someone at Apple is aware and that a fix for this is in the works.