New install done to rule out anything else, installed official Dell drivers.
Every boot I get this.
Intel(R) Dynamic Platform and Thermal Framework : ESIF(8.1.10600.147) TYPE: ERROR
DPTF Build Version: 8.1.10600.147
DPTF Build Date: May 26 2015 13:35:22
Source File: ..\..\..\Sources\Manager\EsifApplicationInterface.cpp @ line 737
Executing Function: DptfEvent
Message: Received unexpected event
Framework Event: DptfResume [3]
Driver uninstalled and reinstalled. No change.
thanks.