diff --git a/Cartfile.resolved b/Cartfile.resolved
index 2a795ea..8e615d2 100644
--- a/Cartfile.resolved
+++ b/Cartfile.resolved
@@ -1,4 +1,4 @@
-github "reitermarkus/DDC.swift" "05141d5bb5d5fd77b22701d03fbec7586aad8fd7"
+github "reitermarkus/DDC.swift" "c77f27c2f2e0c38a1cd95426084a6960e3de2132"
 github "rnine/AMCoreAudio" "3.2.1"
 github "shpakovski/MASPreferences" "1.3"
 github "the0neyouseek/MediaKeyTap" "abfe09f53ccabb1aa14a0f4ab99cfb8812f41919"
diff --git a/MonitorControl.xcodeproj/project.pbxproj b/MonitorControl.xcodeproj/project.pbxproj
index fadfe58..677eec3 100644
--- a/MonitorControl.xcodeproj/project.pbxproj
+++ b/MonitorControl.xcodeproj/project.pbxproj
@@ -429,7 +429,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "if which swiftlint >/dev/null; then\n    swiftlint\nelse\n    echo \"warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint\"\nfi";
+			shellScript = "if which swiftlint >/dev/null; then\n  swiftlint\nelse\n  echo \"warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint\" >&2\nfi\n";
 		};
 /* End PBXShellScriptBuildPhase section */
 
diff --git a/MonitorControl/Display.swift b/MonitorControl/Display.swift
index 363e219..9ba54a1 100644
--- a/MonitorControl/Display.swift
+++ b/MonitorControl/Display.swift
@@ -27,21 +27,21 @@ class Display {
       return
     }
 
-    _ = self.ddc?.write(command: .onScreenDisplay, value: 1)
-    _ = self.ddc?.write(command: .onScreenDisplay, value: 1)
+    _ = self.ddc?.write(command: .osd, value: UInt16(1))
+    _ = self.ddc?.write(command: .osd, value: UInt16(1))
   }
 
   func mute() {
     var value = 0
     if self.isMuted {
-      value = self.prefs.integer(forKey: "\(DDC.Command.audioSpeakerVolume.value)-\(self.identifier)")
+      value = self.prefs.integer(forKey: "\(DDC.Command.audioSpeakerVolume.rawValue)-\(self.identifier)")
       self.isMuted = false
     } else {
       self.isMuted = true
     }
 
     DispatchQueue.global(qos: .userInitiated).async {
-      guard self.ddc?.write(command: .audioSpeakerVolume, value: UInt8(value)) == true else {
+      guard self.ddc?.write(command: .audioSpeakerVolume, value: UInt16(value)) == true else {
         return
       }
 
@@ -60,7 +60,7 @@ class Display {
     }
 
     DispatchQueue.global(qos: .userInitiated).async {
-      guard self.ddc?.write(command: .audioSpeakerVolume, value: UInt8(value)) == true else {
+      guard self.ddc?.write(command: .audioSpeakerVolume, value: UInt16(value)) == true else {
         return
       }
 
@@ -79,23 +79,23 @@ class Display {
     if self.prefs.bool(forKey: Utils.PrefKeys.lowerContrast.rawValue) {
       if value == 0 {
         DispatchQueue.global(qos: .userInitiated).async {
-          _ = self.ddc?.write(command: .contrast, value: UInt8(value))
+          _ = self.ddc?.write(command: .contrast, value: UInt16(value))
         }
 
         if let slider = contrastSliderHandler?.slider {
           slider.intValue = Int32(value)
         }
-      } else if self.prefs.integer(forKey: "\(DDC.Command.brightness.value)-\(self.identifier)") == 0 {
-        let contrastValue = self.prefs.integer(forKey: "\(DDC.Command.contrast.value)-\(self.identifier)")
+      } else if self.prefs.integer(forKey: "\(DDC.Command.brightness.rawValue)-\(self.identifier)") == 0 {
+        let contrastValue = self.prefs.integer(forKey: "\(DDC.Command.contrast.rawValue)-\(self.identifier)")
 
         DispatchQueue.global(qos: .userInitiated).async {
-          _ = self.ddc?.write(command: .contrast, value: UInt8(contrastValue))
+          _ = self.ddc?.write(command: .contrast, value: UInt16(contrastValue))
         }
       }
     }
 
     DispatchQueue.global(qos: .userInitiated).async {
-      guard self.ddc?.write(command: .brightness, value: UInt8(value)) == true else {
+      guard self.ddc?.write(command: .brightness, value: UInt16(value)) == true else {
         return
       }
 
diff --git a/MonitorControl/Info.plist b/MonitorControl/Info.plist
index 7e8cc82..4e6ba48 100644
--- a/MonitorControl/Info.plist
+++ b/MonitorControl/Info.plist
@@ -19,7 +19,7 @@
 	<key>CFBundleShortVersionString</key>
 	<string>1.5.1</string>
 	<key>CFBundleVersion</key>
-	<string>318</string>
+	<string>333</string>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.utilities</string>
 	<key>LSMinimumSystemVersion</key>
diff --git a/MonitorControl/Support/Utils.swift b/MonitorControl/Support/Utils.swift
index 6406934..97e5192 100644
--- a/MonitorControl/Support/Utils.swift
+++ b/MonitorControl/Support/Utils.swift
@@ -42,6 +42,18 @@ class Utils: NSObject {
 
       var values: (UInt16, UInt16)?
 
+      if display.ddc?.supported() == true {
+        os_log("Display supports DDC.", type: .debug)
+      } else {
+        os_log("Display does not support DDC.", type: .debug)
+      }
+
+      if display.ddc?.enableAppReport() == true {
+        os_log("Display supports DDC (enableAppReport).", type: .debug)
+      } else {
+        os_log("Display does not support DDC (enableAppReport).", type: .debug)
+      }
+
       if display.needsLongerDelay {
         values = display.ddc?.read(command: command, tries: 10, minReplyDelay: UInt64(20 * kMillisecondScale))
       } else {
diff --git a/MonitorControl/UI/SliderHandler.swift b/MonitorControl/UI/SliderHandler.swift
index 2c1c845..2330641 100644
--- a/MonitorControl/UI/SliderHandler.swift
+++ b/MonitorControl/UI/SliderHandler.swift
@@ -23,7 +23,7 @@ class SliderHandler {
       slider.integerValue = value
     }
 
-    _ = self.display.ddc?.write(command: self.cmd, value: UInt8(value))
+    _ = self.display.ddc?.write(command: self.cmd, value: UInt16(value))
     self.display.saveValue(value, for: self.cmd)
   }
 }
diff --git a/MonitorControlHelper/Info.plist b/MonitorControlHelper/Info.plist
index 1fa178f..e1b3ac6 100644
--- a/MonitorControlHelper/Info.plist
+++ b/MonitorControlHelper/Info.plist
@@ -19,7 +19,7 @@
 	<key>CFBundleShortVersionString</key>
 	<string>1.5.1</string>
 	<key>CFBundleVersion</key>
-	<string>318</string>
+	<string>333</string>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.utilities</string>
 	<key>LSBackgroundOnly</key>