linux-kernel - Re: [Nouveau] [PATCH 1/7] Revert "ACPI / OSI: Add OEM

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Date:   Mon, 21 Oct 2019 10:54:48 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Karol Herbst <kherbst@...hat.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Alex Hung <alex.hung@...onical.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Dave Airlie <airlied@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        nouveau <nouveau@...ts.freedesktop.org>,
        Mario Limonciello <mario.limonciello@...l.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Dave Airlie <airlied@...hat.com>
Subject: Re: [Nouveau] [PATCH 1/7] Revert "ACPI / OSI: Add OEM _OSI string to
 enable dGPU direct output"

On Mon, Oct 21, 2019 at 10:48 AM Karol Herbst <kherbst@...hat.com> wrote:
>
> fyi: I decided to go for a different workaround to fix the runpm
> issues observed with nvidia gpus with nouveau in the "pci: prevent
> putting nvidia GPUs into lower device states on certain intel bridges"
> thread

OK, I've seen that.

> that's on the pci and pm mailing list. Maybe it makes sense to wait
> for that to land before actually removing the ACPI workarounds here?

Sounds reasonable.

> The workaround I had in this series didn't seem to be reliable enough,
> so I ditched that approached.

OK, please let me know when the _OSI string in question can be dropped.

> On Mon, Oct 21, 2019 at 10:14 AM Rafael J. Wysocki <rafael@...nel.org> wrote:
> >
> > On Mon, Oct 21, 2019 at 4:14 AM Alex Hung <alex.hung@...onical.com> wrote:
> > >
> > > We have done some tests on three of Intel + nVidia configuration
> > > systems with OEM _OSI strings removed - while some bugs are still
> > > observed, ex. one out of three has suspend/resume issues, no system
> > > crashes were observed - the biggest issue that worries us.
> > >
> > > The positive results give us confident to ack the removal of the OEM
> > > _OSI strings. While our tests were not able to cover all possible I+N
> > > systems, we are sure we can fix issues along the way. If there aren't
> > > systems that cannot be fixed without these OEM _OSI strings, these
> > > strings should probably enable with DMI quirks (possible future
> > > patches) so they won't affect others.
> > >
> > > Acked-by: Alex Hung <alex.hung@...onical.com>
> >
> > OK, thanks!
> >
> > I can queue this up or if it's better to route it through the DRM
> > tree, please do that (and let me know).