Re: Possible problem with thunderbolt 4

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Wed, Jan 11, 2023 at 11:38:02AM +0100, Christian Schaubschläger wrote:
> Hi,
> > Okay thanks for checking. I'm discussing with our Windows folks if there
> > is something done differently in Windows side. They do similar reset in
> > certain flows but I'm not sure if it is exactly on "reboot" and it is
> > not clear whether Windows and Linux "reboot" in general is doing the
> > same thing either.
> >
> > In the meantime, did we try this already?
> >
> > 0. Drop all kernel changes
> > 1. Boot the system up, nothing connected
> > 2. Plug in the dock
> > 3. Check that it works (lspci etc.)
> > 4. Unload the Thunderbolt driver
> >
> >   # rmmod thunderbolt
> >
> > 5. Reboot the system
> 
> I think we did not try this one so far. But I did now -> same result...

Okay :(

> What I _did_ find out is this: if I disable ACPI on the kernel command
> line (acpi=off), things work fine. I can even boot with the dock
> unplugged, then plug it when linux is up, and it works in linux, and
> also after the reboot in the firmware!
> 
> Of course switching off ACPI is not a real option... but maybe this
> brings some light into the dark...

It pretty much disables a lot of functionality so I don't think it helps
here, unfortunately.