Is it possible to force the MacBook Pro HDMI output to specific resolution/refresh rate? I have a MacBookPro11,2 connected via HDMI to a 4K television. I would like to try driving the display at various resolutions and frequencies, to see if that might alleviate some problems with signal stability. However the Displays prefpane only offers me a list of "scaled" resolutions, all of which are interpolated up to 4K, meaning the HDMI signal and monitor are still operating at 4K. Is it possible to foce the HDMI output to a specific (lower) resolution/refresh rate?
The answer is: Yes, this is possible.

I found a piece of trialware called SetResX that lets you set arbitrary real resolutions on the HDMI output, and it works!

I also found a video tutorial here that explains how to do that yourself with a substantial bit of effort, and without the nice UI, but I haven't tried that method.