Does the patch not work if you have already upgraded to Sierra?
I bought a 4k monitor and hooked it up with the provided HDMI cable and the Apple Digital AV Adapter. I only have 4k at 30 Hz as an option - no options for hi dpi scaling. If I use a software solution, I can have 1080p hi dpi at 30 Hz.
I tried the patch (and disabled SIP first using the instructions on the 9to5 site) but it gives me multiple error messages when I run it in terminal (I gave it permission with chmod +x first).
I was hoping that Sierra would give me various hi dpi options (1440p would be perfect) without needing to patch anything. Is there something else I should try before returning the monitor?
(This is the monitor if that matters)
I think the HDMI port is what's limiting you to 30hz here.