Create gdm-monitor.nix

2026-01-11 22:57:32 +00:00 · 2026-01-11 22:57:32 +00:00 · 98e2a287a0
commit 98e2a287a0
parent fb5e30c50e
1 changed files with 43 additions and 0 deletions
--- a/settings/gdm-monitor.nix
+++ b/settings/gdm-monitor.nix
@ -0,0 +1,43 @@
+# settings/gdm-monitor-sync.nix
+{ config, pkgs, lib, ... }:
+
+{
+  # Copy monitors.xml to GDM's config directory to prevent display mode changes during login
+  # This eliminates the black screen/signal loss when transitioning from GDM to user session
+  
+  environment.etc."gdm-monitors.xml" = {
+    source = pkgs.writeText "monitors.xml" ''
+      <monitors version="2">
+        <configuration>
+          <layoutmode>physical</layoutmode>
+          <logicalmonitor>
+            <x>0</x>
+            <y>0</y>
+            <scale>1</scale>
+            <primary>yes</primary>
+            <monitor>
+              <monitorspec>
+                <connector>DP-3</connector>
+                <vendor>GBT</vendor>
+                <product>G34WQCP</product>
+                <serial>25272B000088</serial>
+              </monitorspec>
+              <mode>
+                <width>3440</width>
+                <height>1440</height>
+                <rate>190.000</rate>
+              </mode>
+            </monitor>
+          </logicalmonitor>
+        </configuration>
+      </monitors>
+    '';
+    target = "gdm-monitors.xml";
+  };
+
+  # Create GDM config directory and symlink the monitors.xml file
+  systemd.tmpfiles.rules = [
+    "d /var/lib/gdm/.config 0711 gdm gdm"
+    "L+ /var/lib/gdm/.config/monitors.xml - - - - /etc/gdm-monitors.xml"
+  ];
+}