2 files changed, 15 insertions, 0 deletions
diff --git a/nixos/modules/services/x11/hardware/libinput.nix b/nixos/modules/services/x11/hardware/libinput.nix
index 14c7131e611..47ce9e56604 100644
--- a/nixos/modules/services/x11/hardware/libinput.nix
+++ b/nixos/modules/services/x11/hardware/libinput.nix
@@ -227,6 +227,14 @@ in {
         EndSection
       '';
 
+    assertions = [
+      # already present in synaptics.nix
+      /* {
+        assertion = !config.services.xserver.synaptics.enable;
+        message = "Synaptics and libinput are incompatible, you cannot enable both (in services.xserver).";
+      } */
+    ];
+
   };
 
 }
diff --git a/nixos/modules/services/x11/hardware/synaptics.nix b/nixos/modules/services/x11/hardware/synaptics.nix
index e74b19c8e71..5c068e89dd7 100644
--- a/nixos/modules/services/x11/hardware/synaptics.nix
+++ b/nixos/modules/services/x11/hardware/synaptics.nix
@@ -205,6 +205,13 @@ in {
         EndSection
       '';
 
+    assertions = [
+      {
+        assertion = !config.services.xserver.libinput.enable;
+        message = "Synaptics and libinput are incompatible, you cannot enable both (in services.xserver).";
+      }
+    ];
+
   };
 
 }