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 have also raised this as a bug at
https://bugzilla.kernel.org/show_bug.cgi?id=151261. 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.
My impression, and feedback from the linux-usb mailing list, is
therefore that this is a PCI hotplug problem.
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
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
