loading i915 with two graphics cards
Pedro Andres Aranda Gutierrez
paaguti at gmail.com
Thu Jul 28 01:49:26 PDT 2016
Similar problem here with an ASUS with nVidia Optimus... So it's not Mac
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
> > >
> > > 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
> > > which is currently unsupported by the DragonFly graphics stack.
> > Thanks, yes, you're right! It's a laptop, 15" macbookpro (MacBookPro6,2)
> > And yes, turns out apple have gpu switching:
> > 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"
> 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:
> Francois Tigeot
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