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| param(
[int]$Width = 1920,
[int]$Height = 1080,
[int]$Refresh = 120,
[switch]$SignOutAfter
)
# Change resolution/refresh for all attached displays and set system DPI to 100%.
# This version avoids Marshal.SizeOf binder issues by initializing sizes inside C# wrappers.
Add-Type -TypeDefinition @"
using System;
using System.Runtime.InteropServices;
public static class DisplayUtil
{
public const int ENUM_CURRENT_SETTINGS = -1;
public const int DM_BITSPERPEL = 0x00040000;
public const int DM_PELSWIDTH = 0x00080000;
public const int DM_PELSHEIGHT = 0x00100000;
public const int DM_DISPLAYFREQUENCY = 0x00400000;
public const int CDS_UPDATEREGISTRY = 0x00000001;
public const int CDS_TEST = 0x00000002;
public const int DISP_CHANGE_SUCCESSFUL = 0;
public const int DISP_CHANGE_RESTART = 1;
public const int DISPLAY_DEVICE_ATTACHED_TO_DESKTOP = 0x00000001;
public const int DISPLAY_DEVICE_PRIMARY_DEVICE = 0x00000004;
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct DEVMODE
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string dmDeviceName;
public ushort dmSpecVersion;
public ushort dmDriverVersion;
public ushort dmSize;
public ushort dmDriverExtra;
public uint dmFields;
public int dmPositionX;
public int dmPositionY;
public uint dmDisplayOrientation;
public uint dmDisplayFixedOutput;
public short dmColor;
public short dmDuplex;
public short dmYResolution;
public short dmTTOption;
public short dmCollate;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string dmFormName;
public ushort dmLogPixels;
public uint dmBitsPerPel;
public uint dmPelsWidth;
public uint dmPelsHeight;
public uint dmDisplayFlags;
public uint dmDisplayFrequency;
public uint dmICMMethod;
public uint dmICMIntent;
public uint dmMediaType;
public uint dmDitherType;
public uint dmReserved1;
public uint dmReserved2;
public uint dmPanningWidth;
public uint dmPanningHeight;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct DISPLAY_DEVICE
{
public int cb;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string DeviceName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
public string DeviceString;
public int StateFlags;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
public string DeviceID;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
public string DeviceKey;
}
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern bool EnumDisplayDevices(string lpDevice, uint iDevNum, ref DISPLAY_DEVICE lpDisplayDevice, uint dwFlags);
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern bool EnumDisplaySettingsEx(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode, int dwFlags);
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern int ChangeDisplaySettingsEx(string lpszDeviceName, ref DEVMODE lpDevMode, IntPtr hwnd, int dwflags, IntPtr lParam);
public static bool EnumDisplayDevicesInit(uint iDevNum, out DISPLAY_DEVICE device)
{
device = new DISPLAY_DEVICE();
device.cb = Marshal.SizeOf(typeof(DISPLAY_DEVICE));
return EnumDisplayDevices(null, iDevNum, ref device, 0);
}
public static bool EnumDisplaySettingsInit(string deviceName, int modeNum, out DEVMODE mode)
{
mode = new DEVMODE();
mode.dmSize = (ushort)Marshal.SizeOf(typeof(DEVMODE));
return EnumDisplaySettingsEx(deviceName, modeNum, ref mode, 0);
}
public static int TestOrApply(string deviceName, ref DEVMODE mode, bool test)
{
int flags = test ? CDS_TEST : CDS_UPDATEREGISTRY;
return ChangeDisplaySettingsEx(deviceName, ref mode, IntPtr.Zero, flags, IntPtr.Zero);
}
}
"@
function Get-DisplayAdapters {
$result = @()
$i = 0
while ($true) {
$dd = New-Object DisplayUtil+DISPLAY_DEVICE
$ok = [DisplayUtil]::EnumDisplayDevicesInit([uint32]$i, [ref]$dd)
if (-not $ok) { break }
if (($dd.StateFlags -band [DisplayUtil]::DISPLAY_DEVICE_ATTACHED_TO_DESKTOP) -ne 0) {
$result += $dd
}
$i++
}
return $result
}
function Get-ModesForAdapter([string]$deviceName) {
$modes = @()
$modeIndex = 0
while ($true) {
$dm = New-Object DisplayUtil+DEVMODE
$ok = [DisplayUtil]::EnumDisplaySettingsInit($deviceName, $modeIndex, [ref]$dm)
if (-not $ok) { break }
$modes += [pscustomobject]@{
Width = [int]$dm.dmPelsWidth
Height = [int]$dm.dmPelsHeight
Frequency = [int]$dm.dmDisplayFrequency
BitsPerPel = [int]$dm.dmBitsPerPel
Interlaced = (($dm.dmDisplayFlags -band 0x2) -ne 0)
DevMode = $dm
}
$modeIndex++
}
return $modes
}
function Set-DisplayMode([string]$deviceName, [int]$width, [int]$height, [int]$frequency) {
$available = Get-ModesForAdapter -deviceName $deviceName | Where-Object { $_.Width -eq $width -and $_.Height -eq $height -and -not $_.Interlaced }
if (-not $available) {
Write-Warning "[$deviceName] ${width}x${height} not supported. Skipping."
return $false
}
$target = $available | Where-Object { $_.Frequency -eq $frequency } | Select-Object -First 1
if (-not $target) {
$target = $available | Sort-Object Frequency -Descending | Select-Object -First 1
Write-Warning "[$deviceName] ${width}x${height}@${frequency} not found. Using ${width}x${height}@${($target.Frequency)} instead."
}
$dm = $target.DevMode
$dm.dmFields = [DisplayUtil]::DM_PELSWIDTH -bor [DisplayUtil]::DM_PELSHEIGHT -bor [DisplayUtil]::DM_DISPLAYFREQUENCY -bor [DisplayUtil]::DM_BITSPERPEL
if ($dm.dmBitsPerPel -eq 0) { $dm.dmBitsPerPel = 32 }
$test = [DisplayUtil]::TestOrApply($deviceName, [ref]$dm, $true)
if ($test -ne [DisplayUtil]::DISP_CHANGE_SUCCESSFUL) {
Write-Warning "[$deviceName] Mode rejected on test (code $test). Skipping."
return $false
}
$apply = [DisplayUtil]::TestOrApply($deviceName, [ref]$dm, $false)
if ($apply -eq [DisplayUtil]::DISP_CHANGE_SUCCESSFUL) {
Write-Host "[$deviceName] Applied ${($dm.dmPelsWidth)}x${($dm.dmPelsHeight)}@$($dm.dmDisplayFrequency)Hz"
return $true
} elseif ($apply -eq [DisplayUtil]::DISP_CHANGE_RESTART) {
Write-Host "[$deviceName] Applied (requires restart)."
return $true
} else {
Write-Warning "[$deviceName] Failed to apply (code $apply)."
return $false
}
}
function Set-GlobalDpi100 {
try {
New-ItemProperty -Path 'HKCU:\Control Panel\Desktop' -Name 'Win8DpiScaling' -PropertyType DWord -Value 1 -Force | Out-Null
New-ItemProperty -Path 'HKCU:\Control Panel\Desktop' -Name 'LogPixels' -PropertyType DWord -Value 96 -Force | Out-Null
New-ItemProperty -Path 'HKCU:\Control Panel\Desktop\WindowMetrics' -Name 'AppliedDPI' -PropertyType DWord -Value 96 -Force | Out-Null
Write-Host "[DPI] Set to 100% (96 DPI). Sign-out required to fully apply."
return $true
} catch {
Write-Warning "[DPI] Failed: $($_.Exception.Message)"
return $false
}
}
$adapters = Get-DisplayAdapters
if (-not $adapters) {
Write-Error "No active display adapters found."
exit 1
}
$successAny = $false
foreach ($ad in $adapters) {
$ok = Set-DisplayMode -deviceName $ad.DeviceName -width $Width -height $Height -frequency $Refresh
if ($ok) { $successAny = $true }
}
$dpiOk = Set-GlobalDpi100
if ($SignOutAfter -and $dpiOk) {
Write-Host "Signing out to apply DPI changes..."
Start-Process -FilePath "shutdown.exe" -ArgumentList "/l" -WindowStyle Hidden
}
if (-not $successAny) {
Write-Warning "No display modes were changed. Verify that ${Width}x${Height}@$Refresh is supported on your monitors."
}
|