diff --git a/backend/ambilight-ctl b/backend/ambilight-ctl
index cbab1af..c08576d 100755
--- a/backend/ambilight-ctl
+++ b/backend/ambilight-ctl
@@ -66,15 +66,19 @@ def main(argv):
         key, raw = argv[2], argv[3]
         if key in ("reverse",):
             value = raw.lower() in ("1", "true", "yes", "on")
-        elif key == "leds":
+            vtype = "b"
+        elif key in ("leds", "baud"):
             value = int(raw)
+            vtype = "i"
+        elif key in ("port", "side", "capture", "drm_device"):
+            value = str(raw)
+            vtype = "s"
         else:
             value = float(raw)
+            vtype = "d"
         try:
             from gi.repository import GLib
-            res = call("SetParam", GLib.Variant("(sv)", (key, GLib.Variant(
-                "b" if isinstance(value, bool) else "d" if isinstance(value, float) else "i",
-                value))))
+            res = call("SetParam", GLib.Variant("(sv)", (key, GLib.Variant(vtype, value))))
             err = res.unpack()[0]
             if err:
                 print(json.dumps({"ok": False, "error": err}))