From e969da0511ace3d0910f464eacc1b4db4c2ff93f Mon Sep 17 00:00:00 2001
From: Mel <mel@rnrd.eu>
Date: Sun, 11 Jan 2026 18:30:12 +0100
Subject: Update Bismuth monitor layout

Signed-off-by: Mel <mel@rnrd.eu>
---
 configs/monitors.xml         | 75 ++++++--------------------------------------
 machines/bismuth/default.nix |  8 ++---
 machines/bismuth/home.nix    | 10 ++++++
 3 files changed, 23 insertions(+), 70 deletions(-)

diff --git a/configs/monitors.xml b/configs/monitors.xml
index d5d7f3e..a891b26 100644
--- a/configs/monitors.xml
+++ b/configs/monitors.xml
@@ -1,37 +1,14 @@
 <monitors version="2">
-  <!-- only primary, physical, no ghost -->
+  <!-- both monitors -->
   <configuration>
     <layoutmode>physical</layoutmode>
     <logicalmonitor>
       <x>0</x>
       <y>0</y>
       <scale>2</scale>
-      <primary>yes</primary>
       <monitor>
         <monitorspec>
           <connector>DP-2</connector>
-          <vendor>GBT</vendor>
-          <product>M28U</product>
-          <serial>22120B002639</serial>
-        </monitorspec>
-        <mode>
-          <width>3840</width>
-          <height>2160</height>
-          <rate>144.000</rate>
-        </mode>
-      </monitor>
-    </logicalmonitor>
-  </configuration>
-  <!-- 2-monitor, physical, no ghost -->
-  <configuration>
-    <layoutmode>physical</layoutmode>
-    <logicalmonitor>
-      <x>0</x>
-      <y>0</y>
-      <scale>2</scale>
-      <monitor>
-        <monitorspec>
-          <connector>DP-1</connector>
           <vendor>DEL</vendor>
           <product>DELL U2720Q</product>
           <serial>1JSXZ83</serial>
@@ -50,7 +27,7 @@
       <primary>yes</primary>
       <monitor>
         <monitorspec>
-          <connector>DP-2</connector>
+          <connector>DP-3</connector>
           <vendor>GBT</vendor>
           <product>M28U</product>
           <serial>22120B002639</serial>
@@ -63,7 +40,7 @@
       </monitor>
     </logicalmonitor>
   </configuration>
-  <!-- only primary, physical, ghost added -->
+  <!-- secondary (left) monitor only -->
   <configuration>
     <layoutmode>physical</layoutmode>
     <logicalmonitor>
@@ -74,36 +51,6 @@
       <monitor>
         <monitorspec>
           <connector>DP-2</connector>
-          <vendor>GBT</vendor>
-          <product>M28U</product>
-          <serial>22120B002639</serial>
-        </monitorspec>
-        <mode>
-          <width>3840</width>
-          <height>2160</height>
-          <rate>144.000</rate>
-        </mode>
-      </monitor>
-    </logicalmonitor>
-    <disabled>
-      <monitorspec>
-        <connector>None-1</connector>
-        <vendor>unknown</vendor>
-        <product>unknown</product>
-        <serial>unknown</serial>
-      </monitorspec>
-    </disabled>
-  </configuration>
-  <!-- 2-monitor, physical, ghost added -->
-  <configuration>
-    <layoutmode>physical</layoutmode>
-    <logicalmonitor>
-      <x>0</x>
-      <y>0</y>
-      <scale>2</scale>
-      <monitor>
-        <monitorspec>
-          <connector>DP-1</connector>
           <vendor>DEL</vendor>
           <product>DELL U2720Q</product>
           <serial>1JSXZ83</serial>
@@ -115,14 +62,18 @@
         </mode>
       </monitor>
     </logicalmonitor>
+  </configuration>
+  <!-- primary (right) monitor only -->
+  <configuration>
+    <layoutmode>physical</layoutmode>
     <logicalmonitor>
-      <x>3840</x>
+      <x>0</x>
       <y>0</y>
       <scale>2</scale>
       <primary>yes</primary>
       <monitor>
         <monitorspec>
-          <connector>DP-2</connector>
+          <connector>DP-3</connector>
           <vendor>GBT</vendor>
           <product>M28U</product>
           <serial>22120B002639</serial>
@@ -134,13 +85,5 @@
         </mode>
       </monitor>
     </logicalmonitor>
-    <disabled>
-      <monitorspec>
-        <connector>None-1</connector>
-        <vendor>unknown</vendor>
-        <product>unknown</product>
-        <serial>unknown</serial>
-      </monitorspec>
-    </disabled>
   </configuration>
 </monitors>
diff --git a/machines/bismuth/default.nix b/machines/bismuth/default.nix
index 02fda0f..a70d93c 100644
--- a/machines/bismuth/default.nix
+++ b/machines/bismuth/default.nix
@@ -15,10 +15,10 @@
   ];
 
   # set monitor configuration for gdm
-  # NOTE: maybe also use this for ~/.config/monitors.xml?
-  systemd.tmpfiles.rules = [
-    "L+ /run/gdm/.config/monitors.xml - - - - ${../../configs/monitors.xml}"
-  ];
+  # see ./home.nix for user session monitors
+  environment.etc = {
+    "xdg/monitors.xml".source = ../../configs/monitors.xml;
+  };
 
   system.stateVersion = "23.11";
 }
diff --git a/machines/bismuth/home.nix b/machines/bismuth/home.nix
index 2ba6f25..1eb223e 100644
--- a/machines/bismuth/home.nix
+++ b/machines/bismuth/home.nix
@@ -5,5 +5,15 @@
     ../../modules/home/common.nix
   ];
 
+  xdg.configFile = {
+    # monitor configuration for user, for user session and shell
+    # gdm runs outside of the user session, and we also set monitors
+    # for it, in ./default.nix
+    "monitors.xml" = {
+      source = ../../configs/monitors.xml;
+      force = true; # overwrite on change so that the source of truth is the declarative version
+    };
+  };
+
   home.stateVersion = "23.11";
 }
-- 
cgit 1.4.1