loading i915 with two graphics cards

[Pedro Andres Aranda Gutierrez]

Similar problem here with an ASUS with nVidia Optimus... So it's not Mac
specific...

El 28/7/2016 9:25, "Francois Tigeot" <ftigeot at wolfpond.org> escribió:

> On Mon, Jul 18, 2016 at 09:56:57PM +0300, karu.pruun wrote:
> > On Sun, Jul 17, 2016 at 12:50 PM, Francois Tigeot <ftigeot at wolfpond.org>
> > wrote:
> >
> > > > the system (DragonFly 4.5) gets stuck, the screen is frozen at
> console.
> > >
> > > The Geforce GT 330M is apparently a mobile device.
> > > What is your hardware exactly ? If this is a laptop, it is possible
> the two
> > > GPUs are not independent but use something marketed as "optimus
> technology"
> > > which is currently unsupported by the DragonFly graphics stack.
> >
> > Thanks, yes, you're right! It's a laptop, 15" macbookpro (MacBookPro6,2)
> >
> >
> http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i5-2.53-aluminum-15-mid-2010-unibody-specs.html
> >
> > And yes, turns out apple have gpu switching:
> >
> >
> http://www.techworld.com/review/laptops/apple-macbook-pro-15-inch-mid-2010-266ghz-core-i7-review-3223803/
> >
> > I ran FreeBSD for a test; it gets stuck too. Xorg with linux behaves fine
> > though. Xorg log shows two drivers are loaded, nouveau and intel.
> >
> > Until DragonFly's grahpics stack gets this feature, I wonder if there's a
> > way to switch off one gpu so Xorg will run?
>
> It looks like the macbooks are really special and have their video outputs
> connected to a special muxer chip, not directly one or the other GPU.
> Linux apparently is able to switch between them with a "vga_switcheroo"
> driver:
>
> https://www.phoronix.com/scan.php?page=news_item&px=Linux-MacBook-GPU-Switching
>
> Some people also have tried to write a special EFI firmware driver in
> order to
> permanently disable the NVidia GPU and connect the graphic outputs to the
> integrated Intel one:
>
> https://sasanj.wordpress.com/2014/12/03/how-to-turn-off-apple-macbook-pro-discrete-graphics-card-for-linux/
>
> --
> Francois Tigeot
>
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