Broadcom and Nvidia

TLATER · December 13, 2025, 7:21pm

Sadly, the wiki instructions will not work on hyprland (or any wayland compositor), I just finished writing up a rant on how broken the nvidia module is: Can we solve the nvidia situation?

You want something like this, with wlroots:

github.com/TLATER/dotfiles

nixos-modules/nvidia/de-compat.nix

8ced80808


      
          (lib.mkIf (cfg.desktopEnvironment == "wlroots") {
            environment.variables = lib.mkMerge [
              (lib.mkIf (!cfg.offload.enable) {
                GBM_BACKEND = "nvidia-drm";
                # Apparently, without this nouveau may attempt to be used instead
                # (despite it being blacklisted)
                __GLX_VENDOR_LIBRARY_NAME = "nvidia";
                # Hardware cursors are currently broken on wlroots
                WLR_NO_HARDWARE_CURSORS = "1";
              })
              (lib.mkIf cfg.offload.enable { WLR_DRM_DEVICES = "/dev/dri/igpu1:/dev/dri/dgpu1"; })
            ];
          })
          
          # Both GNOME and Plasma guess which GPU should be used, so this
          # *may* not be necessary. However, given NixOS configuration, we
          # already should have an explicit setting from the user, and clearly
          # the guess isn't always correct, so we explicitly set the GPU to
          # use anyway.
          (lib.mkIf (cfg.desktopEnvironment == "gnome") {
            services.udev.packages = lib.mkIf cfg.offload.enable (

Coupled with these udev rules:

github.com/TLATER/dotfiles

nixos-modules/nvidia/prime.nix

8ced80808


      
          services.udev.packages =
            let
              pciPath =
                xorgBusId:
                let
                  components = lib.drop 1 (lib.splitString ":" xorgBusId);
                  toHex = i: lib.toLower (lib.toHexString (lib.toInt i));
          
                  domain = "0000"; # Apparently the domain is practically always set to 0000
                  bus = lib.fixedWidthString 2 "0" (toHex (builtins.elemAt components 0));
                  device = lib.fixedWidthString 2 "0" (toHex (builtins.elemAt components 1));
                  function = builtins.elemAt components 2; # The function is supposedly a decimal number
                in
                "dri/by-path/pci-${domain}:${bus}:${device}.${function}-card";
          
              pCfg = config.hardware.nvidia.prime;
              igpuPath = pciPath (if pCfg.intelBusId != "" then pCfg.intelBusId else pCfg.amdgpuBusId);
              dgpuPath = pciPath pCfg.nvidiaBusId;
            in
            lib.mkIf (config.easyNvidia.desktopEnvironment != "x11") (

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… but yeah, it’s a bit of a mess.