Added Set-ScreenRefreshRate function

base.win/profile.d/ScreenRefreshRate.ps1

@@ -0,0 +1,132 @@
+function Set-ScreenRefreshRate
+{ 
+param ( 
+    [Parameter(Mandatory=$true)] 
+    [int] $Frequency
+) 
+
+    $local:pinvokeCode = @"         
+using System; 
+using System.Runtime.InteropServices; 
+
+namespace Display 
+{ 
+    [StructLayout(LayoutKind.Sequential)] 
+    public struct DEVMODE1 
+    { 
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] 
+        public string dmDeviceName; 
+        public short dmSpecVersion; 
+        public short dmDriverVersion; 
+        public short dmSize; 
+        public short dmDriverExtra; 
+        public int dmFields; 
+
+        public short dmOrientation; 
+        public short dmPaperSize; 
+        public short dmPaperLength; 
+        public short dmPaperWidth; 
+
+        public short dmScale; 
+        public short dmCopies; 
+        public short dmDefaultSource; 
+        public short dmPrintQuality; 
+        public short dmColor; 
+        public short dmDuplex; 
+        public short dmYResolution; 
+        public short dmTTOption; 
+        public short dmCollate; 
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] 
+        public string dmFormName; 
+        public short dmLogPixels; 
+        public short dmBitsPerPel; 
+        public int dmPelsWidth; 
+        public int dmPelsHeight; 
+
+        public int dmDisplayFlags; 
+        public int dmDisplayFrequency; 
+
+        public int dmICMMethod; 
+        public int dmICMIntent; 
+        public int dmMediaType; 
+        public int dmDitherType; 
+        public int dmReserved1; 
+        public int dmReserved2; 
+
+        public int dmPanningWidth; 
+        public int dmPanningHeight; 
+    }; 
+
+    class User_32 
+    { 
+        [DllImport("user32.dll")] 
+        public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE1 devMode); 
+        [DllImport("user32.dll")] 
+        public static extern int ChangeDisplaySettings(ref DEVMODE1 devMode, int flags); 
+
+        public const int ENUM_CURRENT_SETTINGS = -1; 
+        public const int CDS_UPDATEREGISTRY = 0x01; 
+        public const int CDS_TEST = 0x02; 
+        public const int DISP_CHANGE_SUCCESSFUL = 0; 
+        public const int DISP_CHANGE_RESTART = 1; 
+        public const int DISP_CHANGE_FAILED = -1; 
+    } 
+
+    public class PrimaryScreen  
+    { 
+        static public string ChangeRefreshRate(int frequency) 
+        { 
+            DEVMODE1 dm = GetDevMode1(); 
+
+            if (0 != User_32.EnumDisplaySettings(null, User_32.ENUM_CURRENT_SETTINGS, ref dm)) 
+            { 
+                dm.dmDisplayFrequency = frequency;
+
+                int iRet = User_32.ChangeDisplaySettings(ref dm, User_32.CDS_TEST); 
+
+                if (iRet == User_32.DISP_CHANGE_FAILED) 
+                { 
+                    return "Unable to process your request. Sorry for this inconvenience."; 
+                } 
+                else 
+                { 
+                    iRet = User_32.ChangeDisplaySettings(ref dm, User_32.CDS_UPDATEREGISTRY); 
+                    switch (iRet) 
+                    { 
+                        case User_32.DISP_CHANGE_SUCCESSFUL: 
+                        { 
+                            return "Success"; 
+                        } 
+                        case User_32.DISP_CHANGE_RESTART: 
+                        { 
+                            return "You need to reboot for the change to happen.\n If you feel any problems after rebooting your machine\nThen try to change resolution in Safe Mode."; 
+                        } 
+                        default: 
+                        { 
+                            return "Failed to change the resolution"; 
+                        } 
+                    } 
+                } 
+            } 
+            else 
+            { 
+                return "Failed to change the resolution."; 
+            } 
+        } 
+
+        private static DEVMODE1 GetDevMode1() 
+        { 
+            DEVMODE1 dm = new DEVMODE1(); 
+            dm.dmDeviceName = new String(new char[32]); 
+            dm.dmFormName = new String(new char[32]); 
+            dm.dmSize = (short)Marshal.SizeOf(dm); 
+            return dm; 
+        } 
+    } 
+} 
+"@ # don't indend this line
+
+    Add-Type $pinvokeCode -ErrorAction SilentlyContinue
+
+    [Display.PrimaryScreen]::ChangeRefreshRate($frequency)
+}