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 <[email protected]>wrote: > On Sun, May 15, 2011 at 4:47 AM, Tais Plougmann Hansen <[email protected]> > 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 OSD Consulting ApS Tel: +45-78101078 CVR: DK31332737
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