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

[Dom Rodriguez]

Hello,


On this date - Tue, Sep 24, 2019 at 05:54:09PM +0100, Dom Rodriguez wrote:
> On this date - Mon, Sep 23, 2019 at 06:16:25PM +0100, Dom Rodriguez wrote:
> > Hello,
> >
> > On this date - Mon, Sep 23, 2019 at 05:55:46PM +0100, Mick wrote:
> > > On Monday, 23 September 2019 17:39:22 BST Dom Rodriguez wrote:
> > > > On this date - Mon, Sep 23, 2019 at 07:20:56PM +0300, Alexey Mishustin
> > > wrote:
> > > > > пн, 23 сент. 2019 г. в 19:13, Dom Rodriguez <shymega@×××××××××××.uk>:
> > > > > > Hello,
> > > > > >
> > > > > > On this date - Mon, Sep 23, 2019 at 07:01:08PM +0300, Alexey Mishustin
> > > wrote:
> > > > > > > пн, 23 сент. 2019 г. в 18:36, Dom Rodriguez <shymega@×××××××××××.uk>:
> > > > > > > > Alright, I've managed to isolate the issue to the `tps6598.ko' USB-C
> > > > > > > > PD kernel module.
> > > > > > > >
> > > > > > > > I've reached out to the manufacturer of the hub to see if they can
> > > > > > > > advise, but for now, knowing the problem kernel module has
> > > > > > > > definitely helped getting close to solving the problem.
> > > > > > > >
> > > > > > > Hello,
> > > > > > >
> > > > > > > What's the model code of your hub?
> > > > > > >
> > > > > > > --
> > > > > > > Best regards,
> > > > > > > Alex
> > > > > >
> > > > > > Sorry, meant to mention that.. its a Lenovo USb-C Hub C109. I bought it
> > > > > > from Amazon, but the manufacturer sells it under the Lenovo brand -
> > > > > > http://www.novolk.com/productinfo/54884.html>
> > > > > OK. Thanks. It's useful to know which one potentially to avoid.
> > > >
> > > > The thing is, I've tried with a fair few hubs with this laptop, and it
> > > > hasn't been very successful... same issue persists.
> > >
> > > Have you had a look at the UEFI/BIOS settings?  There may be a setting you
> > > need to enable in there.
> >
> > I'm afraid there's no options in the UEFI settings for USB-C power delivery.
>
> I've tested the hub and PD power adapter (Anker) on the same laptop on the
> Windows 10 partition. No luck. The PD chip in the laptop is recognised by
> Windows 10 though.
>
> I've ordered a replacement adapter (Anker), and hub, which should arrive
> tomorrow - I'll see how that goes.
>
> At this point, its either one of three things:
>
> - The laptop hardware.
> - The USB-C hub.
> - The Anker power adapter.
>
> Time will tell....

OK, after much deliberation, I've determined the issue! I'm banging my head on
the wall here after realising the cause.

I was using an Anker power adaptor, which supplies 60W in *total* to both ports
on it - a USB-C port, and a USB-A port. The USB-A port consumes 15W, and the
USB-C port is left with 45W.

The USB-C hub - for example, the one I've got now consumes 18W from the 45W
supplied - which leaves the laptop with 27W. My Thinkpad has a minimum required
USB-C PD wattage of 45W - so that's why it wasn't working!

Thanks to all who helped with this problem.

-- 
Sincerely,
Dom Rodriguez (shymega).