Enhance 14900k configuration with streaming display support and virtual EDID generation

- Added a new `streaming-display.nix` module to configure a headless 4K virtual output for Sunshine and Moonlight. - Introduced a Python script `generate-virtual-edid.py` to create a virtual display EDID with 4K capabilities. - Updated `configuration.nix` to integrate the new streaming display module and enable related services. - Modified `displays.nix` to accommodate the new streaming display settings and ensure compatibility with existing GPU passthrough configurations.
2026-07-10 17:32:37 -03:00
parent dc06c70c43
commit 25cf0167c1
5 changed files with 458 additions and 59 deletions
@@ -0,0 +1,126 @@
+# Headless 4K virtual output for Sunshine → Moonlight on a client TV.
+#
+# NVIDIA proprietary driver: both kernel params are required —
+#   video=<connector>:e              force-enables the connector
+#   drm.edid_firmware=<connector>:…  loads modes from the EDID blob
+#
+# Pick a connector that is disconnected on the host (check after boot):
+#   grep -H . /sys/class/drm/card*-*/status
+#
+# Reboot after changing connector or EDID. 4K@60 is realistic on RTX 2070;
+# 4K@120 on a sink-less connector needs driver patches (see NVIDIA issue #1184).
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.chiasson.system.streamingDisplay;
+
+  edidFirmware = pkgs.runCommand "sunshine-virtual-4k-edid" {
+    nativeBuildInputs = [ pkgs.python3 ];
+  } ''
+    ${pkgs.python3}/bin/python3 ${./generate-virtual-edid.py} $TMPDIR/${cfg.edidFileName}
+    mkdir -p $out/lib/firmware/edid
+    cp $TMPDIR/${cfg.edidFileName} $out/lib/firmware/edid/${cfg.edidFileName}
+  '';
+
+  # Sunshine 2025.924 wlr capture only accepts a numeric monitor index (not "DP-2").
+  # If the index drifts after hotplug, check:
+  #   journalctl --user -u sunshine -b | rg 'Monitor [0-9]+ is'
+  streamDisplayUp = pkgs.writeShellScriptBin "stream-display-up" ''
+    ${pkgs.niri}/bin/niri msg output ${cfg.connector} scale ${toString cfg.niriScale}
+    ${pkgs.niri}/bin/niri msg action focus-monitor ${cfg.connector}
+    ${pkgs.niri}/bin/niri msg action move-window-to-monitor ${cfg.connector} || true
+  '';
+
+  streamDisplayDown = pkgs.writeShellScriptBin "stream-display-down" ''
+    ${pkgs.niri}/bin/niri msg action focus-monitor ${cfg.focusMonitorOnEnd}
+  '';
+in
+{
+  options.chiasson.system.streamingDisplay = {
+    enable = lib.mkEnableOption ''
+      Force-enable a spare NVIDIA DRM connector with a 4K EDID for Sunshine/Moonlight.
+      Requires reboot. Pair with `chiasson.desktop.niri` output config in `displays.nix`.
+    '';
+
+    connector = lib.mkOption {
+      type = lib.types.str;
+      default = "DP-2";
+      example = "HDMI-A-1";
+      description = ''
+        DRM connector name (e.g. `DP-2`, `HDMI-A-1`). Must be unused on the host —
+        14900k desk uses DP-3, DP-4, and HDMI-A-3 by default.
+      '';
+    };
+
+    edidFileName = lib.mkOption {
+      type = lib.types.str;
+      default = "virtual-4k.bin";
+      description = "Filename under `/lib/firmware/edid/` referenced by `drm.edid_firmware`.";
+    };
+
+    mode = lib.mkOption {
+      type = lib.types.str;
+      default = "3840x2160@60";
+      description = "Mode Niri should use on the virtual output (must match EDID).";
+    };
+
+    niriPosition = lib.mkOption {
+      type = lib.types.str;
+      default = "x=7680 y=0";
+      description = ''
+        Niri `position` for the virtual panel — keep it clear of desk monitors
+        so streamed windows do not overlap your ultrawide layout.
+      '';
+    };
+
+    niriScale = lib.mkOption {
+      type = lib.types.float;
+      default = 1.5;
+      example = 1.5;
+      description = ''
+        Niri `scale` on the virtual panel. Values above 1.0 enlarge UI and text
+        on the 4K framebuffer (helpful when viewing on a TV from the couch).
+      '';
+    };
+
+    focusMonitorOnEnd = lib.mkOption {
+      type = lib.types.str;
+      default = "DP-3";
+      description = "Niri monitor to refocus when a Moonlight session ends.";
+    };
+
+    sunshineOutputIndex = lib.mkOption {
+      type = lib.types.str;
+      default = "3";
+      example = "3";
+      description = ''
+        Wayland/wlr monitor index for Sunshine `output_name`. Sunshine 2025.924 ignores
+        connector strings like `DP-2` and falls back to monitor 0 (your primary).
+        Find the index with:
+        `journalctl --user -u sunshine -b | rg "Monitor [0-9]+ is ${cfg.connector}"`
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable (lib.mkMerge [
+    {
+      hardware.firmware = [ edidFirmware ];
+
+      boot.kernelParams = [
+        "video=${cfg.connector}:e"
+        "drm.edid_firmware=${cfg.connector}:edid/${cfg.edidFileName}"
+      ];
+
+      environment.systemPackages = [
+        streamDisplayUp
+        streamDisplayDown
+      ];
+    }
+    (lib.mkIf config.chiasson.system.gaming.sunshine.enable {
+      services.sunshine.settings = {
+        capture = "wlr";
+        output_name = cfg.sunshineOutputIndex;
+        global_prep_cmd = "[{\"do\":\"${streamDisplayUp}/bin/stream-display-up\",\"undo\":\"${streamDisplayDown}/bin/stream-display-down\"}]";
+      };
+    })
+  ]);
+}