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Dell XPS 15 (9560) fan always on when using USB C (thunderbolt 3) port
My new XPS 15 9560's fan are always on when connect to the external monitor using the USB C port. While searching for the issue online, I found many people saying having similar issues - either connect using a USB C dock or any USB C adapter.
http://en.community.dell.com/support-forums/laptop/f/3518/t/20018674
I also have checked the temperatures of the CPU, it's in mid 30s, not high. the temperature of the PCH jumps to 50C from 35C when I connect to the USB C port.. I wonder it must the PCH causing the issue?
robert p
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October 12th, 2017 08:00
Hi okwei,
Thanks for posting.
Have you tried running systems diagostics either from F12 at startup or from Dell Support Assist.
http://dell.to/2xBb1MX
http://dell.to/2xB0xNC
jphughan
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October 12th, 2017 08:00
From reading on NotebookReview, the hypothesized issue is that the Thunderbolt controller activates any time something is connected to the USB-C port, even if it's not a Thunderbolt device, and the Thunderbolt controller itself consumes a fair amount of power and therefore would generate a fair amount of heat. Not sure WHY this has to (or at least does) happen, though.
okwei
14 Posts
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October 12th, 2017 09:00
Everything passed OK.. Am I supposed to see anything particular? this problem has existed since the 9550 days, when it's connected to the Dell docking station..
okwei
14 Posts
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October 12th, 2017 09:00
Well, I have disabled the thunderbolt 3 from BIOS - it didn't help neither..
robert p
9.4K Posts
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October 12th, 2017 09:00
Since everything passed, you may wish to give Tech Support a call for additional troubleshooting.
You can contact Tech Support at 1-800-624-9896 or 1-800-288-4410, or you can initiate a chat session http://dell.to/2v4snVm