Re: [PATCH] [resend] intel_agp: Don't oops with zero stolen memory

[Eric Anholt]

On Fri, 2 Jul 2010 21:59:20 +0200, Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Friday 02 July 2010 00:44:39 Eric Anholt wrote:
> > On Wed, 16 Jun 2010 10:13:52 +0200, Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx> 
> wrote:
> > > When "onboard video memory" is set do "disabled" in BIOS on Asus
> > > P4P800-VM board (i865G), kernel oopses with memory corruption:
> > > https://bugs.freedesktop.org/show_bug.cgi?id=28430
> > >
> > > Fix that by cleanly aborting the initialization.
> > >
> > > Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
> >
> > I haven't seen a system with that option before. Is the integrated
> > graphics still supposed to work at that point, or is it "graphics is
> > disabled."?  What do other OSes do here?
> 
> Testing it right now with Windows XP. Integrated graphics works as secondary 
> only when the "onboard video memory" is set to "disabled"! If anything other 
> is set (e.g. 1MB or 32MB), the driver does not load (code 10).

OK, I was thinking in that case that we should fix the AGP driver's math
so that it correctly set up a chip with no stolen memory allocation.  On
the other hand, I don't think we know what the correct math is, so maybe
we should just go ahead with disabling AGP in that case.

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