Added NVidia GPU usage

app/Gpu/AmdGpuTemperatureProvider.cs

@@ -77,14 +77,14 @@ public class AmdGpuTemperatureProvider : IGpuTemperatureProvider {
     public int? GetGpuUse()
     {
         if (!IsValid)
-            return -1;
+            return null;
 
         if (Adl2.NativeMethods.ADL2_New_QueryPMLogData_Get(_adlContextHandle, _internalDiscreteAdapter.AdapterIndex, out ADLPMLogDataOutput adlpmLogDataOutput) != Adl2.ADL_SUCCESS)
-            return -1;
+            return null;
 
         ADLSingleSensorData gpuUsage = adlpmLogDataOutput.Sensors[(int)ADLSensorType.PMLOG_INFO_ACTIVITY_GFX];
         if (gpuUsage.Supported == 0)
-            return -1;
+            return null;
 
         return gpuUsage.Value;
 

app/Gpu/NvidiaGpuTemperatureProvider.cs

@@ -50,7 +50,19 @@ public class NvidiaGpuTemperatureProvider : IGpuTemperatureProvider
 
     public int? GetGpuUse()
     {
-        return -1;
+        if (!IsValid)
+            return null;
+
+        PhysicalGPU internalGpu = _internalGpu!;
+
+        IUtilizationDomainInfo? gpuUsage = GPUApi.GetUsages(internalGpu.Handle).GPU;
+
+        if (gpuUsage == null) 
+            return null;
+
+        return 
+            (int)gpuUsage?.Percentage;
+
     }
 
 }

app/HardwareMonitor.cs

@@ -57,6 +57,7 @@ public static class HardwareMonitor
         }
         catch (Exception ex)
         {
+            Debug.WriteLine(ex.ToString());
         }
 
         return 0;