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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