autorandr: deterministic and applies for LigthDM

curacao/hardware.nix

@@ -1,4 +1,20 @@
 { pkgs, lib, config, nixos-hardware, displaylinknixpkgs, ... }:
+let
+  displays = {
+    embedded = {
+      output = "eDP-1";
+      edid = "00ffffffffffff000dae381700000000011c01049526157802a155a556519d280b505400000001010101010101010101010101010101b43b804a71383440302035007dd61000001ac32f804a71383440302035007dd61000001a000000fe003059395747803137334843450a00000000000041319e001000000a010a2020004f";
+    };
+    deskLeft = {
+      output = "HDMI-1-3"; # Internal HDMI port
+      edid = "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";
+    };
+    deskRight = {
+      output = "DVI-I-2-1"; # DisplayLink
+      edid = "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";
+    };
+  };
+in
 {
   config = {
     # UEFI works here, and variables can be touched
@@ -14,8 +30,8 @@
     hardware.cpu.intel.updateMicrocode = true;
     frogeye.desktop = {
       x11_screens = [
-        "HDMI-1-3"
+        displays.deskLeft.output
-        "DVI-I-2-1"
+        displays.deskRight.output
       ];
       maxVideoHeight = 1440;
       numlock = true;
@@ -31,9 +47,41 @@
         displaylink = (import displaylinknixpkgs { inherit (super) system; config.allowUnfree = true; }).displaylink;
       })
     ];
-    # Needs prefetched binary blobs, see https://nixos.wiki/wiki/Displaylink
+    services = {
-    services.xserver.videoDrivers = [ "displaylink" "modesetting" ];
+      autorandr = {
-    # TODO See if nvidia and DL can work together.
+        profiles = {
+          portable = {
+            fingerprint.${displays.embedded.output} = displays.embedded.edid;
+            config.${displays.embedded.output} = { };
+          };
+          extOnly = {
+            fingerprint = {
+              ${displays.embedded.output} = displays.embedded.edid;
+              ${displays.deskLeft.output} = displays.deskLeft.edid;
+              ${displays.deskRight.output} = displays.deskRight.edid;
+            };
+            config = {
+              ${displays.embedded.output}.enable = false;
+              ${displays.deskLeft.output} = {
+                primary = true;
+                mode = "1920x1200";
+                rate = "59.95";
+                position = "0x0";
+              };
+              ${displays.deskRight.output} = {
+                mode = "1920x1200";
+                rate = "59.95";
+                position = "1920x0";
+              };
+            };
+          };
+          # TODO leftOnly and other things.Might want to abstract a few things first.
+        };
+      };
+      # Needs prefetched binary blobs, see https://nixos.wiki/wiki/Displaylink
+      xserver.videoDrivers = [ "displaylink" "modesetting" ];
+      # TODO See if nvidia and DL can work together.
+    };
   };
   imports = [
     nixos-hardware.nixosModules.dell-g3-3779

hm/desktop/autorandr/default.nix

@@ -29,4 +29,3 @@ in
     services.autorandr.enable = true;
   };
 }
-# TODO Deterministic configs?

os/default.nix

@@ -7,7 +7,7 @@
     ./boot
     ./ccc
     ./common.nix
-    ./desktop.nix
+    ./desktop
     ./dev
     ./diff
     disko.nixosModules.disko

os/desktop/autorandr.nix

@@ -0,0 +1,21 @@
+{ pkgs, lib, config, ... }:
+let
+  setupScript = "${pkgs.writeShellApplication {
+    name = "greeter-setup-script";
+    runtimeInputs = [ pkgs.autorandr ];
+    text = ''
+      autorandr --change
+    '';
+  }}/bin/greeter-setup-script";
+in
+{
+  config = {
+    services = {
+      autorandr.enable = true;
+      xserver.displayManager.lightdm.extraConfig = ''
+        [Seat:*]
+        display-setup-script = ${setupScript}
+      '';
+    };
+  };
+}

os/desktop/default.nix

@@ -45,4 +45,7 @@
     # So we can use gnome3 pinentry flavour
     services.dbus.packages = [ pkgs.gcr ];
   };
+  imports = [
+    ./autorandr.nix
+  ];
 }