linux-kernel - Re: [PATCH v3] pci: prevent putting nvidia GPUs into lower device states on certain intel bridges

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Message-ID: <20191021132112.GH2819@lahna.fi.intel.com>
Date:   Mon, 21 Oct 2019 16:21:12 +0300
From:   Mika Westerberg <mika.westerberg@...el.com>
To:     Karol Herbst <kherbst@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        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>
Subject: Re: [PATCH v3] pci: prevent putting nvidia GPUs into lower device
 states on certain intel bridges

On Mon, Oct 21, 2019 at 03:02:23PM +0200, Karol Herbst wrote:
> > No, just block runtime PM from the device in nouveau driver.
> 
> but that's not what the patch does. It only skips the PCI PM reg
> write, but still let the ACPI method be invoked to put the device into
> D3cold

Oh, indeed it does. I did not realize that.

Which makes me wonder whether ACPI _OFF() expects the device to be in D0
for some reason.