Re: [REGRESSION 5.0.8] Dell thunderbolt dock broken (xhci_hcd and thunderbolt)

[Mika Westerberg]

+Rafael, Furquan and linux-acpi

(The original thread is here https://lore.kernel.org/lkml/s5hy33siofw.wl-tiwai@xxxxxxx/T/#u)

On Tue, Apr 30, 2019 at 10:39:00AM +0200, Michael Hirmke wrote:
> Hi Takashi,
> 
> [...]
> >>> I also have XPS 9370 but not that particular dock. I will check tomorrow
> >>> if I can reproduce it as well.
> >>
> >> There aren't too many changes between 5.0.7 and 5.0.8 that touch
> >> PCI/ACPI. This is just a shot in the dark but could you try to revert:
> >>
> >>   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi
> >>   t/commit/?h=linux-5.0.y&id=da6a87fb0ad43ae811519d2e0aa325c7f792b13a
> >>
> >> and see if it makes any difference?
> 
> >OK, I'm building a test kernel package with the revert in OBS
> >home:tiwai:bsc1133486 repo.  A new kernel will be
> >kernel-default-5.0.10-*g8edeab8:
> >  http://download.opensuse.org/repositories/home:/tiwai:/bsc1133486/standard/
> 
> >Michael, once when the new kernel is ready, please give it a try.
> 
> as far as I can see, state is back to normal with this kernel.
> No more error messages or crashing modules and all devices seem to work
> as expected.
> Only thing is, that the external devices connected to the Thunderbolt
> dock are coming up a little bit slower than with 5.0.7 - but this is
> nothing, I'd worry about.

Thanks for testing.

Rafael, it seems that commit c8b1917c8987 ("ACPICA: Clear status of GPEs
before enabling them") causes problem with Thunderbolt controllers if
you boot with device (dock) connected.

I think the reason is the same that got fixed in v4.14 with commit
ecc1165b8b74 ("ACPICA: Dispatch active GPEs at init time") which the
above commit essentially undoes if I understand it correctly.