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Bug#816176: linux-image-4.3.0-0.bpo.1-amd64: xhci_hub_control causes abnormally high CPU usage when no USB devices attached

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On Sun, 28 Feb 2016 12:19:43 +0100 Anders Nylander <randomsalad@gmail.com>
wrote:

> Following the removal of of the USB device, I noticed very high CPU usage
> being caused by kworker and ksoftirqd.
> Using perf to log 10s of data and then reading the report, I noticed that
> xhci_hcd/xhci_hub_control was generating a LOT of work for the kworker
> (~42%).

I'm experiencing a very similar behavior on my ThinkPad X250 attached to a
dock. It doesn't happen every time I resume, but quite often these days (on
4.18.8-1). Unplugging an USB3 disk plugged to the dock fixed the problem for
me, and replugging it worked as well, so maybe there's some kind of loop I
managed to break with that.

I also noticed https://bugzilla.redhat.com/show_bug.cgi?id=1325488 on the
exact same setup, but there's no other info there.

I'll try to dig upstream, but unfortunately it's not that easily reproducible
here.

Regards,
- -- 
Yves-Alexis
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Bug#816176: linux-image-4.3.0-0.bpo.1-amd64: xhci_hub_control causes abnormally high CPU usage when no USB devices attached Yves-Alexis Perez <corsac@debian.org> - 2018-09-25 20:30 +0200

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