Re: The Garbled screen issue on Sony laptops with two graphics (Intel and Nvidia)

[Matthew Garrett <mjg59@srcf.ucam.org>]

On Mon, Mar 16, 2009 at 08:28:51PM +0900, Mattia Dongili wrote:
> On Mon, Mar 16, 2009 at 10:24:23AM +0000, Matthew Garrett wrote:
> > _DSM is "Device Specific Method". The magic numbers it requires are 
> > interface descriptions. How many of these machines have nvidia-based 
> > dual GPU architectures?
> 
> SZ and Z have dual GPUs (Intel onboard + NVidia), TT doesn't.

There's been two generations of dual GPU machines - ones that support 
runtime switching (whih I think is limited to the Z?) and ones that 
don't (the early SZs at least, probably all of them). The _DSM stuff 
we're interested in is for the runtime switching.

> >                         Are the _DSM methods always attached to the 
> > nvidia device?
> 
> As far as I can see the Z is the only one having it attached to the
> nvidia device.

In that case I think we're fine only worrying about that case. The 
interesting thing now is in whether this is Sony-specific or whether the 
same method is specified for other systems switching between the nvidia 
chipsets.

-- 
Matthew Garrett | mjg59@srcf.ucam.org