Apply an Intel XTU profile from PowerShell

tune_ps2.ps1

# Must be run under 32-bit PowerShell as ProfilesApi is x86
[System.Reflection.Assembly]::LoadFrom("C:\Program Files (x86)\Intel\Intel(R) Extreme Tuning Utility\Client\ProfilesApi.dll") | Out-Null

# This script programmatically applies an Intel XTU profile. 
# This script can replace the CLI method outlined here: https://www.reddit.com/r/Surface/comments/3vslko/change_cpu_voltage_offset_with_intel_xtu_on/ 

[ProfilesApi.XtuProfileReturnCode]$applyProfileResult = 0
$profileApi = [ProfilesApi.XtuProfiles]::new()
$profileApi.Initialize() | Out-Null

[ProfilesApi.XtuProfileReturnCode]$result = 0
$profiles = $profileApi.GetProfiles([ref] $result)

$profile = $profiles | Where-Object { $_.ProfileName -eq "Undervolt" } | Select-Object -First 1

if ($profile) {
    $applied = $profileApi.ApplyProfile($profile.ProfileID, [ref]$applyProfileResult)
    if ($applied) {
        Write-Host "$applyProfileResult. Profile applied"
    } else {
        Write-Host "$applyProfileResult. Profile not applied." 
    }
}

sleep 10

XTU 6.5.1.371 : I get 'Sucess Profile applied', but it doesn't actually work.

Still have to go into XTU an manually tweak settings each boot to get it to do what I want.

How did you find out which methods to call for the DLL?
If there's a way to find out, I wonder if it'd be possible to also load the IntelOverclockingSDK.dll and apply overclocks, undervolts, etc using the command line this way, now that XtuCli.exe is gone.

The libraries are .NET (managed) assemblies so you can decompile them with ILSpy to see how it works. At least XTU was managed when last used this on 6.5.x.