Stupid NVIDIA 3D vgaarb.c patch

[C Bergström]

For clarity - My testing and the patch is required when the Intel driver
isn't being used at all. After I finish some other testing I can see if
bumblebee and intel driver + this patch will play nicely.

How is a laptop with dual VGA controllers any different than if one
identifies itself as a "3D controller"?

On Tue, Sep 23, 2014 at 4:15 AM, Alex Williamson <alex.williamson at redhat.com
> wrote:

> On Mon, 2014-09-22 at 13:43 -0700, Linus Torvalds wrote:
> > Adding proper people and mailing lists..
> >
> > The PCI_CLASS_DISPLAY_VGA test goes back to the very beginning by
> > BenH, and I have no idea if adding PCI_CLASS_DISPLAY_3D is
> > appropriate, but hopefully somebody does. The fact that it makes
> > things work certainly argues fairly convincingly for it, but I want
> > some backup here.
> >
> > Dave, BenH?
>
> TBH, it seems pretty dubious to me.  There's nothing in the spec that
> would give us reason to believe that a device with a 3D controller class
> code requires VGA arbitration.  Also, if this controller starts
> participating in arbitration then this same laptop will likely disable
> DRI when Intel is the primary graphics due to Xorg wanting to mmap VGA
> MMIO space.  I'm not sure what the solution is, but unfortunately it's
> likely to be much more complicated than this patch.  Thanks,
>
> Alex
>
> > Christopher(?), can you please also specify which laptop etc. And the
> > patch itself seems to have come from somebody else, unless you're
> > Lekensteyn. So we'd want to get the provenance of that too.
> >
> >                 Linus
> >
> > On Mon, Sep 22, 2014 at 1:28 PM, C Bergström <cbergstrom at pathscale.com>
> wrote:
> > > Hi Linus,
> > >
> > > I don't know who the original author is and I can have one of the
> distro
> > > graphics friends review it, but I need this patch below to get NVIDIA
> > > drivers to work (without using any Intel graphics) on my laptop
> > > http://pastebin.com/wpmFi38k
> > >
> > > Sorry - I know this is not the proper way to submit a patch, but it's
> > > trivial and I'm not a kernel dev.
> > >
> > > Thanks
> > >
> > > ./C
>
>
>
>
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