Set-Resolution.ps1

param(
    [Parameter(Mandatory)][int]$Width,
    [Parameter(Mandatory)][int]$Height
)

Add-Type @"
using System;
using System.Runtime.InteropServices;

public sealed class DisplayResolution {
    [DllImport("user32.dll", CharSet = CharSet.Ansi)]
    public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);

    [DllImport("user32.dll", CharSet = CharSet.Ansi)]
    public static extern int ChangeDisplaySettings(ref DEVMODE devMode, int flags);

    public const int ENUM_CURRENT_SETTINGS = -1;
    public const int CDS_UPDATEREGISTRY = 0x01;
    public const int DISP_CHANGE_SUCCESSFUL = 0;
    public const int DISP_CHANGE_RESTART = 1;

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
    public struct DEVMODE {
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
        public string dmDeviceName;
        public short dmSpecVersion;
        public short dmDriverVersion;
        public short dmSize;
        public short dmDriverExtra;
        public int dmFields;
        public int dmPositionX;
        public int dmPositionY;
        public int dmDisplayOrientation;
        public int 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 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;
    }

    public static bool TrySet(int width, int height) {
        DEVMODE dm = new DEVMODE();
        dm.dmSize = (short)Marshal.SizeOf(typeof(DEVMODE));
        if (EnumDisplaySettings(null, ENUM_CURRENT_SETTINGS, ref dm) == 0) {
            return false;
        }
        dm.dmPelsWidth = width;
        dm.dmPelsHeight = height;
        dm.dmFields = 0x80000 | 0x100000; // DM_PELSWIDTH | DM_PELSHEIGHT
        int r = ChangeDisplaySettings(ref dm, CDS_UPDATEREGISTRY);
        return r == DISP_CHANGE_SUCCESSFUL || r == DISP_CHANGE_RESTART;
    }
}
"@

if (-not [DisplayResolution]::TrySet($Width, $Height)) {
    exit 1
}
exit 0