linux-kernel - Re: [PATCH v4] pci: prevent putting nvidia GPUs into lower device states on certain intel bridges

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Message-ID: <CAJZ5v0jNq77xPXxeYeq_JJBCfekVPVPOye1mZwpQi=+=MKSS7w@mail.gmail.com>
Date:   Fri, 22 Nov 2019 10:07:04 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Karol Herbst <kherbst@...hat.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Mika Westerberg <mika.westerberg@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Lyude Paul <lyude@...hat.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        nouveau <nouveau@...ts.freedesktop.org>,
        Dave Airlie <airlied@...il.com>,
        Mario Limonciello <Mario.Limonciello@...l.com>
Subject: Re: [PATCH v4] pci: prevent putting nvidia GPUs into lower device
 states on certain intel bridges

On Fri, Nov 22, 2019 at 1:13 AM Karol Herbst <kherbst@...hat.com> wrote:
>
> so while trying to test with d3cold disabled, I noticed that I run
> into the exact same error.

Does this mean that you disabled d3cold on the GPU via sysfs (the
"d3cold_allowed" attribute was 0) and the original problem still
occurred in that configuration?

> And I verified that the
> \_SB.PCI0.PEG0.PG00._STA returns 1, which indicates it should still be
> turned on.

I don't really understand this comment, so can you explain it a bit to
me, please?