diff --git a/config/Display.nix b/config/Display.nix
new file mode 100644
index 00000000..13b172b4
--- /dev/null
+++ b/config/Display.nix
@@ -0,0 +1,42 @@
+{
+	lib,
+	config,
+	...
+}: let
+	cfg = config.module.display;
+in {
+	# REF: https://www.kernel.org/doc/Documentation/fb/fbcon.txt
+	# REF: https://patchwork.kernel.org/project/dri-devel/patch/20191110154101.26486-10-hdegoede@redhat.com/#22993841
+	config = lib.mkMerge [
+		# NOTE: `tty` name is special.
+		(lib.mkIf (cfg.rotate != null) {
+			boot.kernelParams = lib.mapAttrsToList (name: rotate:
+				let
+					hint =
+						if      rotate == 90  then "left_side_up"
+						else if rotate == 180 then "upside_down"
+						else if rotate == 270 then "right_side_up"
+						else "normal";
+
+					value =
+						if      rotate == 90  then 1
+						else if rotate == 180 then 2
+						else if rotate == 270 then 3
+						else 0;
+
+					command = if name == "tty" then
+						"fbcon=rotate:${toString value}"
+					else
+						"video=${name}:rotate=${toString rotate}";
+						# "video=${name}:panel_orientation=${hint}";
+						# "video=${name}:rotate=${toString rotate},panel_orientation=${hint}";
+				in command
+			) cfg.rotate;
+
+			module.sway.extraConfig = lib.mapAttrsToList (name: rotate:
+				"output ${name} transform ${toString rotate}"
+			) cfg.rotate;
+		})
+	];
+}
+
diff --git a/config/Purpose.nix b/config/Purpose.nix
index 8f84c107..0ddb9db7 100644
--- a/config/Purpose.nix
+++ b/config/Purpose.nix
@@ -101,7 +101,6 @@ in {
 
 		(lib.mkIf cfg.server {
 			module = {
-				keyd.enable = true;
 				kernel = {
 					enable    = true;
 					hardening = true;
diff --git a/home/file/sway/default.nix b/home/file/sway/default.nix
index 9e3d37fa..fa07c8b5 100644
--- a/home/file/sway/default.nix
+++ b/home/file/sway/default.nix
@@ -1,6 +1,7 @@
 {
-	util,
 	config,
+	lib,
+	util,
 	...
 } @args: let
 	swayRc = util.catText [
@@ -32,6 +33,6 @@ in {
 		include /etc/sway/config.d/*
 	'')
 	+ swayRc
-	+ config.module.sway.extraConfig
+	+ lib.concatStringsSep "\n" config.module.sway.extraConfig
 	;
 }
diff --git a/home/file/waybar/config/default.nix b/home/file/waybar/config/default.nix
index 251c2eb5..3c73d018 100644
--- a/home/file/waybar/config/default.nix
+++ b/home/file/waybar/config/default.nix
@@ -16,10 +16,7 @@ in {
 		spacing      = 4;
 		start_hidden = false;
 		output = [
-			"!AOC 24G2W1G4 ATNL61A129625" # Dasha monitor.
-			"!Huawei Technologies Co., Inc. ZQE-CBA 0xC080F622" # Desktop monitor.
-			"!UGD Artist15.6Pro 20200316" # XP-Pen Tablet.
-			"*"
+			config.module.display.primary
 		];
 		modules-left = [
 			"clock"
diff --git a/host/x86_64-linux/dasha/default.nix b/host/x86_64-linux/dasha/default.nix
index 8100c60b..2a8f49ca 100644
--- a/host/x86_64-linux/dasha/default.nix
+++ b/host/x86_64-linux/dasha/default.nix
@@ -6,10 +6,11 @@
 	};
 
 	module = {
+		amd.gpu.enable        = true;
 		builder.client.enable = true;
-		amd.gpu.enable = true;
-		package.extra  = true;
-		print.enable   = true;
+		display.primary       = "DP-1";
+		package.extra         = true;
+		print.enable          = true;
 		purpose = {
 			creativity = true;
 			desktop    = true;
diff --git a/host/x86_64-linux/desktop/default.nix b/host/x86_64-linux/desktop/default.nix
index e8351da8..c69f5f01 100644
--- a/host/x86_64-linux/desktop/default.nix
+++ b/host/x86_64-linux/desktop/default.nix
@@ -14,6 +14,10 @@
 			gaming  = true;
 			work    = true;
 		};
+		display = {
+			primary = "HDMI-A-1";
+			rotate.HDMI-A-1 = 180;
+		};
 		amd = {
 			compute.enable = true;
 			gpu.enable     = true;
@@ -22,11 +26,11 @@
 				powersave = true;
 			};
 		};
-		sway.extraConfig = ''
-			output "ASUSTek COMPUTER INC ASUS VA24E R2LMTF127165" mode 1920x1080@74.986Hz transform 180 pos 780,0
-			output "Huawei Technologies Co., Inc. ZQE-CBA 0xC080F622" pos 0,1080
-			workspace 1 output "ASUSTek COMPUTER INC ASUS VA24E R2LMTF127165"
-		'';
+		sway.extraConfig = [
+			"output DP-3 pos 0,1080"
+			"output HDMI-A-1 mode 1920x1080@74.986Hz pos 780,0"
+			"workspace 1 output HDMI-A-1"
+		];
 		hwmon = {
 			file = "temp1_input";
 			path = "/sys/devices/pci0000:00/0000:00:18.3/hwmon";
diff --git a/host/x86_64-linux/home/default.nix b/host/x86_64-linux/home/default.nix
index 48d6d9fa..879877c2 100644
--- a/host/x86_64-linux/home/default.nix
+++ b/host/x86_64-linux/home/default.nix
@@ -7,6 +7,7 @@
 
 	module = {
 		builder.server.enable = true;
+		display.primary = "HDMI-A-1";
 		purpose = {
 			desktop = true;
 			router  = true;
diff --git a/host/x86_64-linux/laptop/default.nix b/host/x86_64-linux/laptop/default.nix
index 0ae82919..1e1a8f85 100644
--- a/host/x86_64-linux/laptop/default.nix
+++ b/host/x86_64-linux/laptop/default.nix
@@ -8,6 +8,7 @@
 
 	module = {
 		builder.client.enable = true;
+		display.primary = "eDP-1";
 		print.enable = true;
 		purpose = {
 			creativity = true;
diff --git a/host/x86_64-linux/pocket/Boot.nix b/host/x86_64-linux/pocket/Boot.nix
deleted file mode 100644
index 71b1c469..00000000
--- a/host/x86_64-linux/pocket/Boot.nix
+++ /dev/null
@@ -1,6 +0,0 @@
-{ ... }: {
-	boot.kernelParams = [
-		"fbcon=rotate:1"
-		"video=DSI-1:rotate=90"
-	];
-}
diff --git a/host/x86_64-linux/pocket/default.nix b/host/x86_64-linux/pocket/default.nix
index be6f14ae..321255f7 100644
--- a/host/x86_64-linux/pocket/default.nix
+++ b/host/x86_64-linux/pocket/default.nix
@@ -15,10 +15,16 @@
 			laptop     = true;
 			work       = true;
 		};
-		sway.extraConfig = ''
-			output DSI-1 transform 90
-			input type:touch map_to_output DSI-1
-		'';
+		display = {
+			primary = "DSI-1";
+			rotate = {
+				tty   = 90;
+				DSI-1 = 90;
+			};
+		};
+		sway.extraConfig = [
+			"input type:touch map_to_output DSI-1"
+		];
 		hwmon = {
 			file = "temp1_input";
 			path = "/sys/devices/platform/coretemp.0/hwmon";
diff --git a/host/x86_64-linux/work/default.nix b/host/x86_64-linux/work/default.nix
index 1871faa2..7a43b0d4 100644
--- a/host/x86_64-linux/work/default.nix
+++ b/host/x86_64-linux/work/default.nix
@@ -11,6 +11,7 @@
 
 	module = {
 		builder.client.enable      = true;
+		display.primary            = "DSI-1";
 		package.extra              = true;
 		powerlimit.thinkpad.enable = true;
 		print.enable               = true;
diff --git a/option/Display.nix b/option/Display.nix
index 25e31a5e..20e719bf 100644
--- a/option/Display.nix
+++ b/option/Display.nix
@@ -3,8 +3,18 @@
 	lib,
 	...
 }: {
-	options.module.display.dpiAware = lib.mkOption {
-		default = false;
-		type    = lib.types.bool;
+	options.module.display = {
+		dpiAware = lib.mkOption {
+			default = false;
+			type    = lib.types.bool;
+		};
+		primary = lib.mkOption {
+			default = "*";
+			type    = lib.types.str;
+		};
+		rotate = lib.mkOption {
+			default = { };
+			type    = with lib.types; attrsOf (enum [ 0 90 180 270 ]);
+		};
 	};
 }
diff --git a/option/Sway.nix b/option/Sway.nix
index df714b8d..9eb3f5a1 100644
--- a/option/Sway.nix
+++ b/option/Sway.nix
@@ -5,8 +5,8 @@
 	options.module.sway = {
 		enable = lib.mkEnableOption "the Sway WM.";
 		extraConfig = lib.mkOption {
-			default = "";
-			type    = lib.types.str;
+			default = [ ];
+			type    = with lib.types; listOf str;
 		};
 	};
 }