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

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: <CADnq5_NKyK7=C+j+yvxME4u1eN3XEB7n2QnVPEn2QqvwAhquDA@mail.gmail.com>
Date:   Thu, 15 Aug 2019 14:34:08 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Mario.Limonciello@...l.com
Cc:     Takashi Iwai <tiwai@...e.de>, Karol Herbst <kherbst@...hat.com>,
        nouveau <nouveau@...ts.freedesktop.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Alex Hung <alex.hung@...onical.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 Thu, Aug 15, 2019 at 12:19 PM <Mario.Limonciello@...l.com> wrote:
>
> > -----Original Message-----
> > From: Takashi Iwai <tiwai@...e.de>
> > Sent: Thursday, August 15, 2019 9:57 AM
> > To: Alex Deucher
> > Cc: Karol Herbst; Limonciello, Mario; nouveau; Rafael J . Wysocki; LKML; dri-devel;
> > Linux ACPI Mailing List; Alex Hung; Ben Skeggs; David Airlie
> > Subject: Re: [Nouveau] [PATCH 1/7] Revert "ACPI / OSI: Add OEM _OSI string to
> > enable dGPU direct output"
> >
> >
> > [EXTERNAL EMAIL]
> >
> > On Thu, 15 Aug 2019 16:37:05 +0200,
> > Alex Deucher wrote:
> > >
> > > On Thu, Aug 15, 2019 at 10:25 AM Karol Herbst <kherbst@...hat.com> wrote:
> > > >
> > > > On Thu, Aug 15, 2019 at 4:20 PM <Mario.Limonciello@...l.com> wrote:
> > > > >
> > > > > > > There are definitely going to be regressions on machines in the field
> > with the
> > > > > > > in tree drivers by reverting this.  I think we should have an answer for all
> > of
> > > > > > those
> > > > > > > before this revert is accepted.
> > > > > > >
> > > > > > > Regarding systems with Intel+NVIDIA, we'll have to work with partners
> > to
> > > > > > collect
> > > > > > > some information on the impact of reverting this.
> > > > > > >
> > > > > > > When this is used on a system with Intel+AMD the ASL configures AMD
> > GPU to
> > > > > > use
> > > > > > > "Hybrid Graphics" when on Windows and "Power Express" and
> > "Switchable
> > > > > > Graphics"
> > > > > > > when on Linux.
> > > > > >
> > > > > > and what's exactly the difference between those? And what's the actual
> > > > > > issue here?
> > > > >
> > > > > DP/HDMI is not detected unless plugged in at bootup.  It's due to missing
> > HPD
> > > > > events.
> > > > >
> > > >
> > > > afaik Lyude was working on fixing all that, at least for some drivers.
> > > > If there is something wrong, we still should fix the drivers, not
> > > > adding ACPI workarounds.
> > > >
> > > > Alex: do you know if there are remaining issues regarding that with amdgpu?
> > >
> > > There was an issue with hpd events not making it to the audio side
> > > when things were powered down that was fixed with this patch set:
> > > https://patchwork.freedesktop.org/patch/316793/
> > > Those patches depended on a bunch of alsa changes as well which may
> > > have not been available in the distro used for a particular OEM
> > > program.
> >
> > FYI, the corresponding commit for ALSA part is destined for 5.4
> > kernel:
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/?id=ade
> > 49db337a9d44ac5835cfce1ee873549011b27
> >
> > BTW, Nouveau should suffer from the same problem.  The patch to add
> > the audio component support is found at:
> >   https://patchwork.freedesktop.org/patch/319131/
> >
> >
>
> It sounds like 5.3rcX won't be a useful check then.
>
> So am I correct to understand that everything related to the AMD failures
> described in this thread should be in linux-next at this point?
>

Assuming you mean the missing audio hotplug events, then yes.

Alex