linux-kernel - Re: nouveau regression with 5.7 caused by "PCI/PM: Assume ports without DLL Link Active train links in 100 ms"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200724095751.GU1375436@lahna.fi.intel.com>
Date:   Fri, 24 Jul 2020 12:57:51 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Karol Herbst <kherbst@...hat.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 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@...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.

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).