Hi ikke42,

Thanks for posting.  Apologies that your system is not performing as expected.

If you still require assistance and the system is under warranty, you may contact me privately. Be sure to include your personal information (name, address, telephone, email) and your computer's service tag number in your message. Thanks.

If there is no warranty, then you could contact our Out of Warranty team to get a quote for a paid service request. 

We still haven't heard from you. We need to close the case for now, but should you need further help or assistance, feel free to reach out to us again.
We do hope that this matter was resolved.
Kind regards.

keyaertch,

Click the link here to update the thunderbolt controller driver and application as well as the bios update.

keyaertch,

Hopefully, that will resolve the issue. 

keyaertch,

Has your Windows OS updated to the latest version of Windows 10? Reinstall the chipset drivers, reboot and then install the Thunderbolt drivers and the thunderbolt application. 

XPS 9380 Drivers click here

Thank you for your message. How long have you been having this issue?

What is the current BIOS version installed?

Have you made any changes to power management or changes to BIOS?

Is the system connected to a docking station or is there any external device connected?

Do you see any events recorded in the event viewer?

For my reference, please click on the message tab next to your avatar– click “New Message” & search for my Dell username (Sreejith R) & send a private message with the service tag, registered name & email address.

How to locate the service tag

Hi! 

The problem happens just one day after I bought the machine and randomly happens afterward.

BIOS version is updated to the newest as soon as I got the machine. Power Management is set to standard, and the power plan of windows is balanced.

It is frequently connected to a dock with a Bluetooth mouse, a keyboard and an external monitor(DELL) connected. I noticed that in 60 seconds after I plugging or removing any Type-C device, the CPU Usage of System would drop to normal and soon returned to around 30%.

Thank you for reminding me to check the event viewer. I DO find a special event that seems to be highly related. My CPU usage just again raises to around 30 and there is a critical event from Kernel-Power logged by System. I suspect this is just the cause.

What should I do to fix the problem?

Thank you.

I have the exact same problem. XPS 9380, i7, 16GB and 500GB SSD. The "System" process takes 25+% CPU constantly and it happens randomly. Once it starts the only way to stop it is to restart the computer. I used Process Explorer to find out exactly what was happening and it seems that it is a thread in ACPI.sys which is causing it.

I had my laptop running off battery for a couple of hours. When I reconnected the power through the USB-C port on the right side of the computer the System process CPU usage went up to 25% and now it just stays there.