> Linux support is spottier, especially when using multiple displays of varying DPIs, but even Gnome works pretty well on a HiDPI laptop these days.

Actually, Gnome is the only one that doesn’t do proper HiDPI support. It only supports 96 and 192dpi - not any other ratio.

In comparison, Qt supports different ratios for every screen, all ratios specified as float – you can even scale up, down, whatever.

The environment variable used is

    QT_SCREEN_SCALE_FACTORS=DisplayPort-2=1.75;HDMI-A-0=1.08;