Hotplug not working for USB 3.1 docking station on Dell XPS 13

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Hi,

I'm having problems with a Plugable USB-C docking station, with my laptop, a Dell XPS 13 (9350). If the docking station is plugged in at boot, it works correctly; however, when I hotplug it after boot, the USB devices are not detected until I force a rescan of the PCI bus.

I originally assumed this was a problem with the PCI subsystem, so reported it at https://bugzilla.kernel.org/show_bug.cgi?id=151261, but was sent on from there to here. In any case, there are some dmesg traces and lspci logs attached to that bug.

The lspci output suggests a chain of three PCI bridges (00:1c.0, 01:00.0, 02:02.0) before a PCI->USB bridge (05:00.0 or 39:00.0). If I boot without the docking station plugged in, 01:00.0 and beyond do not appear, and nor do they appear on hotplug. However, if I hotplug the docking station and then force a rescan with "echo 1 > /sys/bus/pci/devices/0000:00:1c.0/rescan", the PCI bridges and USB devices appear and spring into life.

There are some ACPI errors in the dmesg at hotplug but they don't really mean much to me.

I'd really appreciate any suggestions on how to proceed with this.

Thanks

Richard van der Hoff
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