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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Message-ID: <a80a591ce61b632503c9ed52adc7c40faad8b068.camel@redhat.com>
Date:   Tue, 21 Jul 2020 14:24:19 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Karol Herbst <kherbst@...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>,
        Patrick Volkerding <volkerdi@...il.com>,
        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 Tue, 2020-07-21 at 12:00 -0400, Lyude Paul wrote:
> On Tue, 2020-07-21 at 18:27 +0300, 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.
> 
> Will give it a shot today and let you know the result

Ahh-actually, I thought the laptop I had locally could reproduce this bug but
that doesn't appear to be the case whoops. Karol Herbst still has access to a
machine that can test this though, so they'll likely get to trying the patch
today or tommorrow

> 
-- 
Cheers,
	Lyude Paul (she/her)
	Software Engineer at Red Hat