[Nouveau] properly check for _DSM function support and Optimus support for vga_switcheroo

[Lekensteyn]

It's works on a muxless Clevo B7130  intel / nvidia GT425M. It has also
been tested
on the legacy optimus call, although that crashed X
http://pastebin.com/9Sum3tT3
That bug is said to be fixed
http://cgit.freedesktop.org/xorg/xserver/commit/?id=fb22a408c69a84f81905147de9e82cf66ffb6eb2

2011/12/19 Omar Andrés Zapata Mesa <andresete.chaos at gmail.com>

> Tested on toshiba m645 optimus intel/nvidia 310m
> output
> bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.P0P2.VGA_
> [21832.787656] bbswitch: detected an Optimus _DSM function
> [21832.787664] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is
> on
> but dont work nvidia video card.  do it work with not mux optimus?
>
>
> On Sat, Dec 17, 2011 at 5:50 PM, Lekensteyn <lekensteyn at gmail.com> wrote:
>
>> Hello guys,
>>
>> I've prepared a patch based on my findings for the bbswitch module
>> (https://github.com/Lekensteyn/acpi-stuff/tree/master/bbswitch). This
>> adds a proper
>> check whether a _DSM function is supported or not and make OFF / ON for
>> vga_switcheroo work for nVidia Optimus models. The patch is based against
>> the
>> mainline kernel.
>>
>> It has been tested on my Clevo B7130 laptop running kernel 3.2 which has
>> a GT425M
>> dGPU:
>> # cat /sys/kernel/debug/vgaswitcheroo/switch
>> 0:IGD:+:Pwr:0000:00:02.0
>> 1:DIS: :Pwr:0000:01:00.0
>> # tee /sys/kernel/debug/vgaswitcheroo/switch <<<OFF
>> OFF
>> # cat /sys/kernel/debug/vgaswitcheroo/switch
>> 0:IGD:+:Pwr:0000:00:02.0
>> 1:DIS: :Off:0000:01:00.0
>> # tee /sys/kernel/debug/vgaswitcheroo/switch <<<ON
>> ON
>> # cat /sys/kernel/debug/vgaswitcheroo/switch
>> 0:IGD:+:Pwr:0000:00:02.0
>> 1:DIS: :Pwr:0000:01:00.0
>>
>> The iGPU/dGPU LEDS on the keyboard also change as a result.
>>
>> A second patch to make the device stay off after suspend is in progress.
>>
>> Regards,
>> Peter
>>
>>
>> _______________________________________________
>> Nouveau mailing list
>> Nouveau at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/nouveau
>>
>>
>
>
> --
> Omar Andres Zapata Mesa
> Fundamental Interaction Phenomenology Gruop (Gfif)
> Head Developer
> http://gfif.udea.edu.co
> Gfif Developers (Gfif Dev)
> Division of computer science
> http://gfifdev.udea.edu.co
> System Engineering Student
> Universidad de Antioquia At Medellin - Colombia
> Usuario Linux  #490962
>
>
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