kde5: cannot modify screen, kscreen is missing

[FRidh]

Using a checkout of master, it is not possible to adjust screen settings using KDE's systemsettings; kscreen seems to be missing.
cc @ttuegel

[ttuegel]

Are you using plasma5_stable or plasma5_latest?

[FRidh]

I have

services.xserver.desktopManager.kde5.enable = true;

and

    kde5.okular
    kde5.plasma-workspace
    kde5.plasma-desktop
    kde5.kate

in systemPackages.

In all-packages.nix is specified that

  plasma54 = recurseIntoAttrs (import ../desktops/plasma-5.4 { inherit pkgs; });
  plasma55 = recurseIntoAttrs (import ../desktops/plasma-5.5 { inherit pkgs; });
  plasma5_stable = plasma54;
  plasma5_latest = plasma55;

  kde5 = kf5_stable // plasma5_stable // kdeApps_stable;

and in the module kde5.nix

  kf5 = pkgs.kf5_stable;
  plasma5 = pkgs.plasma5_stable;
  kdeApps = pkgs.kdeApps_stable;

so the answer to your question in plasma5_stable :-)

[ttuegel]

The default backend for kscreen seems to be missing. I am investigating.

[retrry]

Just updated my NixOS installation and it seems that I too have this problem.

No kscreen backend found. Please check your kscreen installation.

[ttuegel]

This is fixed in 98bd111.

[FRidh]

Thanks a lot!

[rolfschr]

I had this issue on NixOS 22.11 and wasn't able to resolve it by installing manually kscreen. However, I also manually installed libkscreen (sudo nix-env -iA libsForQt5.libkscreen) and after rebooting it worked.