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From:   Alex Hung <alex.hung@canonical.com>
Date:   Mon, 9 Sep 2019 22:07:42 +0100
Message-ID: <CAJ=jquaLthK556Lqk-zc3GCOus90HoGs66tA=d9a1aju7iNpPw@mail.gmail.com>
Subject: Re: [Nouveau] [PATCH 1/7] Revert "ACPI / OSI: Add OEM _OSI string to
 enable dGPU direct output"
To:     "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc:     Karol Herbst <kherbst@redhat.com>, Dave Airlie <airlied@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux ACPI <linux-acpi@vger.kernel.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        nouveau <nouveau@lists.freedesktop.org>,
        Mario Limonciello <mario.limonciello@dell.com>,
        Ben Skeggs <bskeggs@redhat.com>,
        Dave Airlie <airlied@redhat.com>
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On Thu, Sep 5, 2019 at 5:26 PM Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
>
> On Thursday, September 5, 2019 5:51:23 PM CEST Karol Herbst wrote:
> > is there any update on the testing with my patches? On the hardware I
> > had access to those patches helped, but I can't know if it also helped
> > on the hardware for which those workarounds where actually added.
>
> Alex Hung and Mario need to answer this question I think.

Sorry for taking a long time. I don't have full testing results yet
but we found at least a regression occurred with _OSI string removed -
it is not on nVidia hardware but on AMD PX one.

I will try to collect and share more details.

>
> > On Mon, Aug 19, 2019 at 11:52 AM Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
> > >
> > > On Thursday, August 15, 2019 12:47:35 AM CEST Dave Airlie wrote:
> > > > On Thu, 15 Aug 2019 at 07:31, Karol Herbst <kherbst@redhat.com> wrote:
> > > > >
> > > > > This reverts commit 28586a51eea666d5531bcaef2f68e4abbd87242c.
> > > > >
> > > > > The original commit message didn't even make sense. AMD _does_ support it and
> > > > > it works with Nouveau as well.
> > > > >
> > > > > Also what was the issue being solved here? No references to any bugs and not
> > > > > even explaining any issue at all isn't the way we do things.
> > > > >
> > > > > And even if it means a muxed design, then the fix is to make it work inside the
> > > > > driver, not adding some hacky workaround through ACPI tricks.
> > > > >
> > > > > And what out of tree drivers do or do not support we don't care one bit anyway.
> > > > >
> > > >
> > > > I think the reverts should be merged via Rafael's tree as the original
> > > > patches went in via there, and we should get them in asap.
> > > >
> > > > Acked-by: Dave Airlie <airlied@redhat.com>
> > >
> > > The _OSI strings are to be dropped when all of the needed support is there in
> > > drivers, so they should go away along with the requisite driver changes.
> > >
> >
> > that goes beside the point. firmware level workarounds for GPU driver
> > issues were pushed without consulting with upstream GPU developers.
> > That's something which shouldn't have happened in the first place. And
> > yes, I am personally annoyed by the fact, that people know about
> > issues, but instead of contacting the proper persons and working on a
> > proper fix, we end up with stupid firmware level workarounds. I can't
> > see why we ever would have wanted such workarounds in the first place.
> >
> > And I would be much happier if the next time something like that comes
> > up, that the drm mailing list will be contacted as well or somebody
> > involved.
> >
> > We could have also just disable the feature inside the driver (and
> > probably we should have done that a long time ago, so that is
> > essentially our fault, but still....)
> >
> > > I'm all for dropping then when that's the case, so please feel free to add ACKs
> > > from me to the patches in question at that point.
> > >
> > > Cheers,
> > > Rafael
> > >
> > >
> > >
> >
>
>
>
>


-- 
Cheers,
Alex Hung