[Nix-dev] virutalbox ova - screen settings reset on every restart

[Stephan Sahm]

Dear NixOS followers,

I tried to use the nixOS virtualbox from https://d3g5gsiof5omrk.
cloudfront.net/nixos/17.03/nixos-17.03.1449.2e983f14f6/nixos-17.03.1449.2e983f14f6-x86_64-linux.ova

It starts correctly, however, if I try to adapt the display scaling or
resolution to adapt for my 4k screen, the setting is lost on a restart. (As
KDE tells me to restart for the settings to become active, I never actually
see a rescaled KDE, but everything is very tiny).

So the question how to make these display settings be preserved upon
restart.
(I successfully isntalled git and okular and cloned some repositories and
stuff - everything is preserved as it should, only the display settings
seem to get lost sofar)

Any help is highly appreciated!,
best,
Stephan

[Linus Heckemann]

Post by Stephan Sahm
Dear NixOS followers,
I tried to use the nixOS virtualbox
from https://d3g5gsiof5omrk.cloudfront.net/nixos/17.03/nixos-17.03.1449.2e983f14f6/nixos-17.03.1449.2e983f14f6-x86_64-linux.ova
<https://d3g5gsiof5omrk.cloudfront.net/nixos/17.03/nixos-17.03.1449.2e983f14f6/nixos-17.03.1449.2e983f14f6-x86_64-linux.ova>
It starts correctly, however, if I try to adapt the display scaling or
resolution to adapt for my 4k screen, the setting is lost on a restart.
(As KDE tells me to restart for the settings to become active, I never
actually see a rescaled KDE, but everything is very tiny).
So the question how to make these display settings be preserved upon
restart.
(I successfully isntalled git and okular and cloned some repositories
and stuff - everything is preserved as it should, only the display
settings seem to get lost sofar)
Any help is highly appreciated!,
best,
Stephan

Setting X up to inform Plasma of the right resolution might help ­— try
adding

services.xserver.monitorSection = ''
DisplaySize width height
'';

to your config, where width and height are the real-world dimensions of
the screen (assuming you're running the VM full-screen) in millimetres.