I would like to acknowledge that Eva and Matze did a great job with the
sony-laptop module, which
is a good solution for the only-intel or only-nvidia options.

I remember Matze mentioning in previous emails that he was investigating
some other options for communicating with the nvidia card. I've recently
started compiling a list of laptop models that have hybrid graphics cards,
with ATI PowerXpress or Nvidia SLI HybridGraphics capabilities:


As you can see, there are other DSDT tables there for hybrid nvidia laptops.
Maybe this information is relevant to compare against the vaio z DSDT table.

We've exchanged emails in this mailing list (see archives) with the
linux-acpi developer Matthew Garrett. Here are are some of his comments:

1) Nvidia hybrid machines. These have been worked out. I sent a driver
to the linux-acpi mailing list that will disable whichever chip is not
in use. Runtime switching is easy from a technology point of view, but
currently impossible from the point of view of POSTing the nvidia gpu or
getting X to handle switchover.

He also mentioned that some of the work in the nouveau drivers could have a
positive impact in being able to hot-switching the nvidia card on and off.
But this work is still not complete.

So in an optimistic mood I can say that I think there's been a lot of work
done and there are good prospects for more!



> >
> > However, I hope there'll be a solution. Some day, maybe...
> Also I think alot of people joined the Sony Vaio launchpad in hope to solve
> the card switching problems (according to the discussions here).
> I also bought my Vaio because of its great nvidia card.
> Regards.
> --
> Zuzanna K. Filutowska
> Home page: http://platyna.platinum.linux.pl/.
> NIC-HDL: ZKF-RIPE, IRC nick: Platyna, Linux RU: #289909.
> Well? I will go far, As the echo of the devout bell goes. --Sarah Brightman
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