linux-kernel - Re: [PATCH v6] pci: prevent putting nvidia GPUs into lower device states on certain intel bridges

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Message-ID: <20200306054006.GZ2540@lahna.fi.intel.com>
Date:   Fri, 6 Mar 2020 07:40:06 +0200
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 v6] pci: prevent putting nvidia GPUs into lower device
 states on certain intel bridges

On Thu, Mar 05, 2020 at 05:11:57PM +0100, Karol Herbst wrote:
> On Wed, Mar 4, 2020 at 10:33 AM Mika Westerberg
> <mika.westerberg@...el.com> wrote:
> >
> > Hi,
> >
> > On Tue, Mar 03, 2020 at 11:10:52AM +0100, Karol Herbst wrote:
> > > Fixes state transitions of Nvidia Pascal GPUs from D3cold into higher device
> > > states.
> >
> > I think it is good to explain bit more here why this fix is needed.
> >
> 
> is something like this fine?
> 
> Fixes the infamous 'runpm' bug many users are facing on Laptops with Nvidia
> Pascal GPUs by skipping PCI power state changes on the GPU.

I would open up 'runpm' -> runtime PM.

> It's still unknown why this issue exists, but this is a reliable workaround
> and solves a very annoying issue for user having to choose between a
> crashing kernel or higher power consumption of their Laptops.

Also I think it would be good to include a short log snippet how this
manifests and in what kind of scenario it happens.