I'm using a 13" retina MBP with Kubuntu, and I wouldn't describe the hidpi support as awful. You need to make sure that X has the right DPI setting and additio

I'm using a 13" retina MBP with Kubuntu, and I wouldn't describe the hidpi support as awful. You need to make sure that X has the right DPI setting and additionally make some explicit adjustments like resizing the mouse cursor and choosing big icons for everything. Once that is set right, KDE programs work nicely. Some non-KDE programs (such as Spotify) are rendered pixel by pixel the same as on a regular/low dpi screen. So there are some glitches, but for day to day use it is absolutely workable :)