diff --git a/src/modules/powerdisplay/PowerDisplay.Lib/Drivers/WMI/WmiController.cs b/src/modules/powerdisplay/PowerDisplay.Lib/Drivers/WMI/WmiController.cs
index aef6c553b7..acbdf13707 100644
--- a/src/modules/powerdisplay/PowerDisplay.Lib/Drivers/WMI/WmiController.cs
+++ b/src/modules/powerdisplay/PowerDisplay.Lib/Drivers/WMI/WmiController.cs
@@ -4,6 +4,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
@@ -114,13 +115,12 @@ namespace PowerDisplay.Common.Drivers.WMI
                     {
                         // Call WmiSetBrightness method
                         // Parameters: Timeout (uint32), Brightness (uint8)
-                        // Note: Using int instead of byte to avoid WBEM_E_TYPE_MISMATCH (0x80041005)
-                        // Some WMI driver implementations expect VT_I4 instead of VT_UI1
+                        // Note: WmiLight requires string values for method parameters
                         using (WmiMethod method = obj.GetMethod("WmiSetBrightness"))
                         using (WmiMethodParameters inParams = method.CreateInParameters())
                         {
-                            inParams.SetPropertyValue("Timeout", 0u);
-                            inParams.SetPropertyValue("Brightness", brightness);
+                            inParams.SetPropertyValue("Timeout", "0");
+                            inParams.SetPropertyValue("Brightness", brightness.ToString(CultureInfo.InvariantCulture));
 
                             uint result = obj.ExecuteMethod<uint>(
                                 method,
@@ -367,8 +367,8 @@ namespace PowerDisplay.Common.Drivers.WMI
                         using (WmiMethod method = obj.GetMethod("WmiSetBrightness"))
                         using (WmiMethodParameters inParams = method.CreateInParameters())
                         {
-                            inParams.SetPropertyValue("Timeout", 0u);
-                            inParams.SetPropertyValue("Brightness", 50);
+                            inParams.SetPropertyValue("Timeout", "0");
+                            inParams.SetPropertyValue("Brightness", "50");
                             obj.ExecuteMethod<uint>(method, inParams, out WmiMethodParameters outParams);
                             return false; // If successful, no elevation required
                         }