From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mika Westerberg <mika.westerberg@intel.com>
Subject: Re: [PATCH v3] pci: prevent putting nvidia GPUs into lower device
 states on certain intel bridges
Date: Mon, 21 Oct 2019 16:21:12 +0300
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To: Karol Herbst <kherbst@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Bjorn Helgaas <bhelgaas@google.com>, Lyude Paul <lyude@redhat.com>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, Linux PCI <linux-pci@vger.kernel.org>, Linux PM <linux-pm@vger.kernel.org>, dri-devel <dri-devel@lists.freedesktop.org>, nouveau <nouveau@lists.freedesktop.org>
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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.