diff --git a/hosts/argon/configuration.nix b/hosts/argon/configuration.nix
index 69e2064..1652c1f 100644
--- a/hosts/argon/configuration.nix
+++ b/hosts/argon/configuration.nix
@@ -30,6 +30,13 @@
   # set hostname
   networking.hostName = "argon";
 
+  # Use s2idle instead of deep (S3) suspend. On resume from S3 the RDNA4
+  # (Navi 48 / RX 9070) amdgpu does a MODE1 GPU reset that leaves niri with a
+  # black screen until it is restarted. s2idle avoids that reset path.
+  # Host-specific on purpose: laptops (e.g. neon) keep deep S3 for lower
+  # suspend power draw. Merged with bootloader.nix's kernelParams.
+  boot.kernelParams = [ "mem_sleep_default=s2idle" ];
+
   # install state version
   system.stateVersion = "25.11"; # Don't change
 }
diff --git a/modules/nixos/bootloader.nix b/modules/nixos/bootloader.nix
index 910b8d4..dc6f623 100644
--- a/modules/nixos/bootloader.nix
+++ b/modules/nixos/bootloader.nix
@@ -17,7 +17,7 @@
   };
 
   # kernel options
-  boot.kernelParams = [ "quiet" "acpi.debug_level=0" "mem_sleep_default=s2idle" ];
+  boot.kernelParams = [ "quiet" "acpi.debug_level=0" ];
   boot.kernelPackages = pkgs.linuxPackages_latest;
   boot.consoleLogLevel = 2;