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

From: Takashi Iwai <tiwai@suse.de>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Michael Hirmke <opensuse@mike.franken.de>,
	bhelgaas@google.com, gregkh@linuxfoundation.org, jslaby@suse.cz,
	linux-kernel@vger.kernel.org, lukas@wunner.de, tiwai@suse.de,
	Christian Kellner <ckellner@redhat.com>
Subject: Re: [REGRESSION 5.0.8] Dell thunderbolt dock broken (xhci_hcd and thunderbolt)
Date: Tue, 30 Apr 2019 00:07:19 +0200	[thread overview]
Message-ID: <s5hsgu0ihyg.wl-tiwai@suse.de> (raw)
In-Reply-To: <20190429203630.GW2583@lahna.fi.intel.com>

On Mon, 29 Apr 2019 22:36:30 +0200,
Mika Westerberg wrote:
> 
> On Mon, Apr 29, 2019 at 11:13:47PM +0300, Mika Westerberg wrote:
> > On Mon, Apr 29, 2019 at 10:03:00PM +0200, Michael Hirmke wrote:
> > > Hi all,
> > > 
> > > >On Mon, Apr 29, 2019 at 09:47:15PM +0200, Takashi Iwai wrote:
> > > >> Hi,
> > > 
> > > >Hi,
> > > 
> > > >> we've got a regression report wrt xhci_hcd and thunderbolt on a Dell
> > > >> machine.  5.0.7 is confirmed to work, so it must be a regression
> > > >> introduced by 5.0.8.
> > > >>
> > > >> The details are found in openSUSE Bugzilla entry:
> > > >>   https://bugzilla.opensuse.org/show_bug.cgi?id=1132943
> > > >>
> > > [...]
> > > >>
> > > >> I blindly suspected the commit 3943af9d01e9 and asked for a reverted
> > > >> kernel, but in vain.  And now it was confirmed that the problem is
> > > >> present with the latest 5.1-rc, too.
> > > >>
> > > >> I put some people who might have interest and the reporter (Michael)
> > > >> to Cc.  If anyone has an idea, feel free to join to the Bugzilla, or
> > > >> let me know if any help needed from the distro side.
> > > 
> > > >Since it exists in 5.1-rcX also it would be good if someone
> > > >who see the problem (Michael?) could bisect it.
> > > 
> > > I know the meaning of bisecting, but I'm not really a developer, so I am
> > > probably not able to interpret the results.
> > 
> > No worries. 
> > 
> > I'm adding Christian who reported similar (same?) problem last week.
> > Christian, this seems to exist in v5.1-rc6 at least. Can you try to
> > bisect it on your side?
> > 
> > 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.git/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.

thanks,

Takashi