Re: [gentoo-user] USB-C PD delivery & Lenovo USB-C hub.

[Dom Rodriguez]

Hello,

On this date - Sun, Sep 22, 2019 at 06:43:50PM +0100, Mick wrote:
> On Sunday, 22 September 2019 18:06:50 BST Dom Rodriguez wrote:
> > ... Of course, it _would_ help, if I had provided the link to the hub
> > itself!
> >
> > https://www.amazon.co.uk/gp/product/B07919ZNB4
> >
> > :)
> >
> > On this date - Sun, Sep 22, 2019 at 06:01:42PM +0100, Dom Rodriguez wrote:
> > > Hello,
> > >
> > > I've got an Lenovo Thinkpad X270 laptop, with USB-C support. I ordered an
> > > Lenovo USB-C hub from Amazon the other day, and it arrived today. It [the
> > > hub] is recognised by the kernel for USB, but not for power delivery
> > > (PD), via ACPI.
> > >
> > > Oddly enough, when I plug the USB-C cable from the mains adapter directly
> > > to the USB-C port, ACPI recognises it fine - so I've narrowed it down to
> > > a driver issue.
>
> I assume you have enabled the USB-C drivers in the kernel and also PCI
> hotplug?
>
> https://wiki.gentoo.org/wiki/USB/Guide#USB_Type-C_and_Thunderbolt
>
>
> > > I've tried using the hub on my Thinkpad 13" on both Windows and Linux
> > > (Arch, specifically; Gentoo isn't on there at the moment.), and its
> > > recognised fine. Therefore I do not believe the hub *itself* is faulty.
> > >
> > > In terms of diagnostic information, I'm not sure where to start, so if
> > > anyone needs certain information to help with the issue, please let me
> > > know, and I'll do my best to email it.
> > >
> > > I'm running gentoo-sources-5.3.1 for the kernel.
> > >
> > > Any ideas? Thanks :-)
>
> I don't have such a device to advise on the specifics, but look at dmesg,
> lspci -knn, lsusb to see if the device is recognised, or if any errors on
> missing components are reported.
> --
> Regards,
> Mick

Yeah, I've enabled the USB-C drivers in the kernel and enabled PCI hotplug as
well.

The device isn't recognised in `lspci` or `lsusb`. `lshw` on the other hand
reports that 'pci:0', is unclaimed. "pci:1" appears to be the main PCI bridge
for the laptop. Could well be that "pci:0" is the hub..

As far as I can see in `dmesg`, nothing there is reported either.

A rather odd issue.

-- 
Sincerely,
Dom Rodriguez (shymega).