hybrid-graphics-linux team mailing list archive

[Tais Plougmann Hansen <taisph@xxxxxx>]

Thank you for the clarification.

I'm stuck right now, so I guess I'll let it rest for a little while and then
take a look again with fresh eyes.

On Sun, May 15, 2011 at 15:12, Alex Williamson
<alex.l.williamson@xxxxxxxxx>wrote:

> On Sun, May 15, 2011 at 4:47 AM, Tais Plougmann Hansen <taisph@xxxxxx>
> wrote:
> > True, this was while X was running. Without X I get "client 1 refused
> > switch". :)
> > Even though I have no experience with DSDT, I've been trying to read
> > thedisassembly anyway and this is what I've come up with for the ThinkPad
> > W520 with Nvidia Quadro 2000M:
> > _DSM
> >
> {0xF8,0xD8,0x86,0xA4,0xDA,0x0B,0x1B,0x47,0xA7,0x2B,0x60,0x42,0xA6,0xB5,0xBE,0xE0}
> > 0x100 0x1A {0x0,0x0,0x0,0x0}
> > First argument seems to be a buffer compare with the 16 specified bytes.
> > Second argument has to be 0x100 or what looks like an error code will be
> > returned.
> > The third argument seems to be either 0x00, 0x10, 0x1A or 0x1B.
> > I can't figure out the fourth one.
> > I don't know if I need to call any other methods before/after this.
>
> The format of the _DSM is defined in the ACPI spec.  The first
> argument is 16 byte UUID, identifying the interface the DSM provides.
> The second argument is a version number.  The third argument is the
> function within the DSM to invoke.  Function 0 is defined in the ACPI
> spec to return a bitmap of supported functions.  This allows a way to
> query the interface and see if it's available.  The fourth argument is
> the parameters for the call.  Technically the fourth parameter should
> be an ACPI package, but acpi_call doesn't support that.  The nouveau
> switcheroo driver uses an integer, which only works on a small subset
> of implementations.  Using a buffer should provide reasonable
> compatibility.
>
> As to what functions 0x10, 0x1A, and 0x1B do in your DSDT... I don't
> know.  Thanks,
>
> Alex
>



-- 
Regards,
Tais Plougmann Hansen

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