Force Gamescope to use NVIDIA graphics card on hybrid system

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This is apparently an issue with gamescope 3.15.0 and above as reported in Assertion '!modifiers.empty()' when running gamescope in embedded mode · Issue #1215 · ValveSoftware/gamescope · GitHub

The easiest workaround is to backport the version to 3.14.29 until this is fixed:

  nixpkgs.overlays = [
    (_: prev: {
      gamescope = prev.gamescope.overrideAttrs (_: rec {
        version = "3.14.29";
        src = prev.fetchFromGitHub {
          owner = "ValveSoftware";
          repo = "gamescope";
          rev = "refs/tags/${version}";
          fetchSubmodules = true;
          hash = "sha256-q3HEbFqUeNczKYUlou+quxawCTjpM5JNLrML84tZVYE=";
        };
      });
    })
  ];

You should probably do this as an overlay to override this for all launchers that might use the derivation.

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