I use:

sudo echo "1" > /sys/bus/pci/devices/0000\:02\:00.0/remove

To remove only the affected PCIe card (mine is a PCIe USB 3.1 controller
card), and

echo "1" > /sys/bus/pci/rescan

To get it back online.
Though it only gets it back temporarily until the event is fired again.

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https://bugs.launchpad.net/bugs/1795763

Title:
  xhci_hcd ERROR unknown event type 15

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