Disable Power Management completely in Xenapp/Xendesktop

opwn powershell in Studio and run the following Commands

Add-PSSnapin *Citrix*
Set-BrokerDesktopGroup -Name * -AutomaticPowerOnForAssigned $False
Set-BrokerDesktopGroup -Name * -AutomaticPowerOnForAssignedDuringPeak $False
Set-BrokerDesktopGroup -Name * -OffPeakBufferSizePercent 0
Set-BrokerDesktopGroup -Name * -PeakBufferSizePercent 0
Set-BrokerDesktopGroup -Name * -ShutdownDesktopsAfterUse $True

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