linux-kernel - 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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Date:   Thu, 23 Jul 2020 22:30:58 +0200
From:   Karol Herbst <kherbst@...hat.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Patrick Volkerding <volkerdi@...il.com>,
        Lyude Paul <lyude@...hat.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        nouveau <nouveau@...ts.freedesktop.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: nouveau regression with 5.7 caused by "PCI/PM: Assume ports
 without DLL Link Active train links in 100 ms"

On Wed, Jul 22, 2020 at 11:25 AM Mika Westerberg
<mika.westerberg@...ux.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.