Created
March 11, 2025 20:27
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A PowerShell script to change the screen frequency
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function Set-ScreenRefreshRate | |
{ | |
param ( | |
[Parameter(Mandatory=$true)] | |
[int] $Frequency | |
) | |
$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) | |
} | |
function Get-ScreenRefreshRate | |
{ | |
$frequency = Get-WmiObject -Class "Win32_VideoController" | Select-Object -ExpandProperty "CurrentRefreshRate" | |
return $frequency | |
} | |
$currentFrequency = Get-ScreenRefreshRate | |
Write-Host "Current refresh rate: $currentFrequency Hz" | |
Set-ScreenRefreshRate -Frequency 59 | |
$currentFrequency = Get-ScreenRefreshRate | |
Write-Host "New refresh rate: $currentFrequency Hz" |
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