linux-kernel - Re: [PATCH] Revert "drm/nouveau/fifo/gk104: kick channels when deactivating them"

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Date:	Fri, 14 Aug 2015 12:49:17 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Afzal Mohammed <afzal.mohd.ma@...il.com>
Cc:	Alexandre Courbot <acourbot@...dia.com>,
	David Airlie <airlied@...ux.ie>,
	Ben Skeggs <bskeggs@...hat.com>,
	Eric Biggers <ebiggers3@...il.com>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "drm/nouveau/fifo/gk104: kick channels when
 deactivating them"

On Wed, Aug 12, 2015 at 6:59 PM, Afzal Mohammed <afzal.mohd.ma@...il.com> wrote:
> Hi,
>
> On Wed, Aug 12, 2015 at 04:40:57PM +0900, Alexandre Courbot wrote:
>
>> Great, thanks. Are you also on an optimus configuration with the
>> NVIDIA card being the secondary GPU?
>
> Spec says graphic processor is NVIDIA GeForce NV14P-GV2 GT40M, system
> is Lenovo E431 laptop.
>
> I am a stranger here, started Kernel journey towards north and reached
> south since the system wasn't booting :), don't know how to find it is
> an optimus configuration, if above details aren't enough, let me know
> how to find out.

Thanks for the details!

An optimus configuration means that display and basic acceleration is
provided by an integrated Intel graphics, and the NVIDIA GPU can be
switched on/off dynamically to provide more power when needed.

According to your laptop reference, this seems to be the kind of
configuration you have. It is relevant because this issue seems to
happen when the NVIDIA GPU is switched off during boot.
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