From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lekensteyn <lekensteyn-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: properly check for _DSM function support and Optimus
	support for vga_switcheroo
Date: Sat, 17 Dec 2011 13:14:02 +0100
Message-ID: <CALBR5ZxR9iuvT57bDZ8yW9ZkZjuoUhBTYw4HBsmsiwoRi4gSkw@mail.gmail.com>
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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.

Regards,
Peter

--14dae93405bf2bbbd104b448a7ff
Content-Type: text/html; charset=ISO-8859-1
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Hello guys,<br><br>I&#39;ve prepared a patch based on my findings for the b=
bswitch module<br>(<a href=3D"https://github.com/Lekensteyn/acpi-stuff/tree=
/master/bbswitch">https://github.com/Lekensteyn/acpi-stuff/tree/master/bbsw=
itch</a>). This adds a proper<br>
check whether a _DSM function is supported or not and make OFF / ON for<br>=
vga_switcheroo work for nVidia Optimus models. The patch is based against t=
he<br>mainline kernel.<br><br>It has been tested on my Clevo B7130 laptop r=
unning kernel 3.2 which has a GT425M<br>
dGPU:<br># cat /sys/kernel/debug/vgaswitcheroo/switch<br>0:IGD:+:Pwr:0000:0=
0:02.0<br>1:DIS: :Pwr:0000:01:00.0<br># tee /sys/kernel/debug/vgaswitcheroo=
/switch &lt;&lt;&lt;OFF<br>OFF<br># cat /sys/kernel/debug/vgaswitcheroo/swi=
tch<br>
0:IGD:+:Pwr:0000:00:02.0<br>1:DIS: :Off:0000:01:00.0<br># tee /sys/kernel/d=
ebug/vgaswitcheroo/switch &lt;&lt;&lt;ON<br>ON<br># cat /sys/kernel/debug/v=
gaswitcheroo/switch<br>0:IGD:+:Pwr:0000:00:02.0<br>1:DIS: :Pwr:0000:01:00.0=
<br>
<br>The iGPU/dGPU LEDS on the keyboard also change as a result.<br><br>Rega=
rds,<br>Peter<br>

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