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Date:   Fri, 24 Jul 2020 12:57:51 +0300
From:   Mika Westerberg <mika.westerberg@linux.intel.com>
To:     Karol Herbst <kherbst@redhat.com>
Cc:     Patrick Volkerding <volkerdi@gmail.com>,
        Lyude Paul <lyude@redhat.com>,
        Bjorn Helgaas <helgaas@kernel.org>,
        Linux PCI <linux-pci@vger.kernel.org>,
        Ben Skeggs <bskeggs@redhat.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        nouveau <nouveau@lists.freedesktop.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Kai-Heng Feng <kai.heng.feng@canonical.com>,
        Sasha Levin <sashal@kernel.org>
Subject: Re: nouveau regression with 5.7 caused by "PCI/PM: Assume ports
 without DLL Link Active train links in 100 ms"
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On Thu, Jul 23, 2020 at 10:30:58PM +0200, Karol Herbst wrote:
> On Wed, Jul 22, 2020 at 11:25 AM Mika Westerberg
> <mika.westerberg@linux.intel.com> wrote:
> >
> > On Tue, Jul 21, 2020 at 01:37:12PM -0500, Patrick Volkerding wrote:
> > > On 7/21/20 10:27 AM, Mika Westerberg wrote:
> > > > On Tue, Jul 21, 2020 at 11:01:55AM -0400, Lyude Paul wrote:
> > > >> Sure thing. Also, feel free to let me know if you'd like access to one of the
> > > >> systems we saw breaking with this patch - I'm fairly sure I've got one of them
> > > >> locally at my apartment and don't mind setting up AMT/KVM/SSH
> > > > Probably no need for remote access (thanks for the offer, though). I
> > > > attached a test patch to the bug report:
> > > >
> > > >   https://bugzilla.kernel.org/show_bug.cgi?id=208597
> > > >
> > > > that tries to work it around (based on the ->pm_cap == 0). I wonder if
> > > > anyone would have time to try it out.
> > >
> > >
> > > Hi Mika,
> > >
> > > I can confirm that this patch applied to 5.4.52 fixes the issue with
> > > hybrid graphics on the Thinkpad X1 Extreme gen2.
> >
> > Great, thanks for testing!
> >
> 
> yeah, works on the P1G2 as well.

Thanks for testing!

Since we have the revert queued for this release cycle, I think I will
send an updated version of "PCI/PM: Assume ports without DLL Link Active
train links in 100 ms" after v5.9-rc1 is released that has this
workaround in place.

(I'm continuing my vacation so will be offline next week).