NixOS on a Dell 15" 9560 with the 4K screen.
May 7, 2017
I tried enabling bumblebee on an older kernel (4.10). This works at runtime, but breaks booting — it seems that the nvidia card can't be active during boot otherwise the display just freezes. So what does work is booting without the nvidia module, switching to a configuration where it's enabled, manually unloading nouveau (requires stopping X server), manually loading nvidia, then restarting X and running applications in optirun. Needless to say, this sucks. The joys of proprietary drivers…
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fonts.fontconfig.dpifixed scale issues with GTK applications also.