This is false. My Ubuntu desktop handles 4K DPI scaling perfectly, while attached to a 1440p with normal scaling as well. On the other hand my 2012 MacBook scales extremely weird when connected to a 4K display through HDMI.

This is why I said it is very application dependent. How does MySQL Manager work on your Ubuntu desktop for example?

> multi-monitors much better than any other OS out there right now.

No it doesn't. OSX in fact has a completely innane behaviour when a MBPr is connected to an external monitor. Meaning you have to mirror or put it in clamshell mode. You can't extend the monitor ontot he laptop screen. Works perfectly well in Linux for me.

Huh? I have 2 external monitors (connected using DP) and my laptop running as 1 large desktop right now. Both externals are 1920x1200 running off a rMBP. Dragging windows around scales properly and mostly works.

Last time I tried this on Linux it was a mess, particularly when moving windows from the HiDPI to the normal and back.

How do you mean? I'm connected from my Macbook Pro to two (non-Apple) external monitors (one on thunderbolt, other on HDMI) and they extend just fine - no mirroring or clamshell mode.

If anything, clamshell mode is the buggy one - it has a tendency to go into or come out of sleep mode when I don't want it to.

That's both surprising and disappointing. I'll check for that, thanks.