On a Windows Server 2012 system you will find a ServerCore module with two cmdlets
Get-DisplayResolution
Set-DisplayResolution
On a full GUI system the cmdlets work
PS> Get-DisplayResolution
1366×768
1280×1024
And thats it! Not a lot but it shows the basic information
You set the resolution like this
Set-DisplayResolution -Width 1366 -Height 768
If you look in the functions both actually call the setres command!