[PATCH] vbe: Fix caching of DDC support status

[Adam Jackson]

On Mon, 2012-08-06 at 16:51 -0700, Keith Packard wrote:
> Adam Jackson <ajax at redhat.com> writes:
> 
> > There are multiple kinds of "not supported" here.  One of them is where
> > the video BIOS doesn't support the entrypoint.  Another is where the
> > BIOS returns nothing because no monitor happens to be connected.  In the
> > latter case we should just pretend we haven't checked yet, otherwise
> > plugging in a monitor later and retrying DDC would fail.
> 
> This all makes sense, but I'd love to know if someone else has tried
> this or has a better understanding of this code before I merge it into
> master.

Well, it's shipping in RHEL 6.3, because this needs it (because I
haven't properly fixed DDC to be native yet, as it didn't work on all
the GPUs I had available to test):

http://cgit.freedesktop.org/xorg/driver/xf86-video-mga/log/?h=g200se-randr-1.2

I've been trying to make my commit messages lucid enough that
non-domain-experts can follow them, but it doesn't seem to be having the
desired effect.

- ajax
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