[NAME] You could try clearing the BIOS: You should note your BIOS settings before clearing the BIOS. 1. Turn the power off to PC, and unplug the AC cord 2. Press and hold the power button for 30 sec. 3. Open the case and remove the coin-cell battery 4. Press and hold the power button for 30 sec. 5. Reinstall the coin-cell battery 6. Close the case, reconnect the AC cord 7. Reboot the PC See the Service Manual for how to remove the coin-cell battery.
Since updating the BIOS today event viewer is showing new errors as follows: Log Name: SystemSource: Microsoft-Windows-Kernel-Processor-PowerDate: 02/03/2021 12:32:25Event ID: 34Task Category: (1)Level: ErrorKeywords:User: SYSTEMComputer: XPS8940Description:Idle power management features on processor 0 in group 0 are disabled due to a firmware problem. Check with the computer manufacturer for updated firmware. XPS8940  Log Name: SystemSource: Microsoft-Windows-Kernel-Processor-PowerDate: 02/03/2021 12:32:25Event ID: 55Task Category: (47)Level: InformationKeywords:User: SYSTEMComputer: XPS8940Description:Processor 0 in group 0 exposes the following power management capabilities: Idle state type: ACPI Idle (C) States (1 state(s)) Performance state type: ACPI Collaborative Processor Performance ControlNominal Frequency (MHz): 2904Maximum performance percentage: 165Minimum performance percentage: 41Minimum throttle percentage: 3 I.E. for each logical processor in sequence, an event 34 followed immediately by 55. Message definitely was not there prior to this update. No change in behaviour observed otherwise. Any thoughts, please?
XPS 8940, BIOS 2.0.11, Event id 34 and 55