#Requires -Version 5.1
<#
    JbTecWiz Support Centre -- generated fix script

    Fault : Second monitor not detected, or wrong resolution and refresh rate
    Fix   : Force a DisplayPort renegotiation
    Source: https://jbtecwiz.com/support/win-hw-monitor

    Run as     : The hardware, then PowerShell
    Expect     : 15 minutes
    Risk       : low
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    DisplayPort or USB-C, especially after sleep or a monitor power cycle.

    HOW TO UNDO IT
    Re-import the exported registry keys.

    This script walks the fix one step at a time and asks before each
    one. Steps with no command are things you do yourself -- it prints
    those and waits. Run with -DryRun to print without executing.

    --------------------------------------------------------------------
    NO WARRANTY - USE AT YOUR OWN RISK

    This script is provided by JbTecWiz as-is and with no warranty of any
    kind, express or implied. You run it entirely at your own risk.

    JbTecWiz accepts no liability for any loss or damage arising from its
    use, including but not limited to data loss, downtime, or configuration
    changes that turn out to be wrong for your system.

    You are responsible for reading this script before running it, for
    satisfying yourself that it suits the machine in front of you, and for
    having a working backup first. Some steps cannot be undone.
    --------------------------------------------------------------------
#>

[CmdletBinding()]
param(
    # Print every step and command without running anything.
    [switch]$DryRun,
    # Do not ask before each step. Read the script first if you use this.
    [switch]$Unattended
)

$ErrorActionPreference = 'Stop'
$script:Failed = 0

function Write-Rule { param([string]$Text)
    Write-Host ''
    Write-Host ('-' * 70) -ForegroundColor DarkGray
    if ($Text) { Write-Host $Text -ForegroundColor Cyan }
}

function Show-Prose { param([string]$Text, [string]$Colour = "Gray")
    if (-not $Text) { return }
    $words = $Text -split "\s+"; $line = "  "
    foreach ($w in $words) {
        if (($line.Length + $w.Length) -gt 74) { Write-Host $line -ForegroundColor $Colour; $line = "  " }
        $line += "$w "
    }
    if ($line.Trim()) { Write-Host $line -ForegroundColor $Colour }
}

function Invoke-Step {
    param(
        [int]$Number, [string]$Do, [string]$Why,
        [scriptblock]$Command, [switch]$Manual, [string]$Shell = "powershell"
    )
    Write-Rule "  Step $Number of 5"
    Show-Prose $Do "White"
    if ($Why) { Write-Host ""; Show-Prose $Why "DarkGray" }

    if ($Manual) {
        Write-Host ''
        Write-Host '  -> Do this yourself, then press Enter to carry on.' -ForegroundColor Yellow
        if (-not $Unattended -and -not $DryRun) { [void](Read-Host) }
        return
    }

    Write-Host ''
    foreach ($l in ($Command.ToString().Trim() -split "`n")) {
        Write-Host ("    " + $l.Trim()) -ForegroundColor Green
    }
    Write-Host ''

    if ($DryRun) { Write-Host "  (dry run -- not executed)" -ForegroundColor DarkGray; return }
    if (-not $Unattended) {
        $a = Read-Host "  Run this step? [Y]es / [S]kip / [Q]uit"
        if ($a -match "^[Qq]") { Write-Host "  Stopped at your request."; exit 0 }
        if ($a -match "^[Ss]") { Write-Host "  Skipped." -ForegroundColor DarkGray; return }
    }
    try { & $Command }
    catch {
        $script:Failed++
        Write-Host ("  Step $Number failed: " + $_.Exception.Message) -ForegroundColor Red
        Show-Prose "The rest of the fix may depend on this. Read the write-up before carrying on." "Red"
        if (-not $Unattended) {
            $c = Read-Host "  Carry on anyway? [y/N]"
            if ($c -notmatch "^[Yy]") { exit 1 }
        }
    }
}

Write-Rule
Write-Host '  Second monitor not detected, or wrong resolution and refresh rate' -ForegroundColor White
Write-Host '  Force a DisplayPort renegotiation' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: low   Reversible   15 minutes'
Write-Host ''
Show-Prose 'No warranty. Use at your own risk - JbTecWiz accepts no liability. Read it before you run it, and have a backup.' 'DarkYellow'
Write-Rule

if (-not $Unattended -and -not $DryRun) {
    $go = Read-Host '  Ready? [y/N]'
    if ($go -notmatch "^[Yy]") { Write-Host "  Nothing was changed."; exit 0 }
}

Invoke-Step -Number 1 -Do 'Unplug the DisplayPort cable at both ends, wait ten seconds, and reconnect the monitor end first.' -Why 'DisplayPort signals hot-plug detection over a dedicated pin. When a monitor powers off before the PC, the PC removes the display and does not always re-add it -- the manual replug is what triggers the detection event.' -Manual

Invoke-Step -Number 2 -Do 'Force a detection pass.' -Command {
    Start-Process ms-settings:display
}

Invoke-Step -Number 3 -Do 'In Display settings, use Multiple displays -> Detect.' -Manual

Invoke-Step -Number 4 -Do 'Clear the cached configuration for that monitor so Windows re-reads its capabilities.' -Command {
    Get-ChildItem 'HKLM:\SYSTEM\CurrentControlSet\Control\GraphicsDrivers\Configuration' | Select-Object -First 10 Name
}

Invoke-Step -Number 5 -Do 'Renaming or exporting then deleting the Configuration and Connectivity keys under GraphicsDrivers forces a clean re-detect at the next boot. Export them first.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'The display appears with its native resolution available.' 'White'
Write-Host ''
if (-not $DryRun) {
    Get-CimInstance -Namespace root\wmi -ClassName WmiMonitorBasicDisplayParams | Format-Table InstanceName,MaxHorizontalImageSize,MaxVerticalImageSize
}

Write-Rule
if ($script:Failed -gt 0) {
    Write-Host ("  Finished with " + $script:Failed + " failed step(s).") -ForegroundColor Yellow
    Show-Prose 'Read the full write-up at https://jbtecwiz.com/support/win-hw-monitor' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Re-import the exported registry keys.' 'DarkGray'
Write-Rule