hybrid-graphics-linux team mailing list archive

[Gianpaolo Cugola <gianpaoloc@xxxxxxxxx>]

After some more investigation I noticed that the Latitude E6420 DSDT
has the device:

\_SB.PCI0.PEG0.PEGP

which is often the right one in sandy bridge machines, but it does not
include the _OFF method for this device. Do you think I could try with
a modified DSDT that adds such method? Does this make any sense? Any
suggestion how to proceed (I am really new at this kind of stuff)?

Thanks
  G.


On 15 April 20
On 15 April 2011 20:27, Gianpaolo Cugola <gianpaoloc@xxxxxxxxx> wrote:
> I already tried the dell script (sorry, I forgot to mention). It does not work.
>
> Here is my DSDT.dsl (I forgot to attach it before).
>
> Let me know how may I help.
>
> Ciao
>  G.
>
>
> On 15 April 2011 17:17, Sunil Mujumdar <sunil_mujumdar@xxxxxxxxx> wrote:
>>
>> Have you tried this version of the script written for Dell XPS laptops ? Let
>> me know if it works.
>>
>> Sunil.
>>
>> ________________________________
>> From: Gianpaolo Cugola <gianpaoloc@xxxxxxxxx>
>> To: hybrid-graphics-linux@xxxxxxxxxxxxxxxxxxx
>> Sent: Fri, April 15, 2011 5:36:08 AM
>> Subject: [Hybrid-graphics-linux] Dell Latitude E6420
>>
>> The machine has an I7 2720QM cpu with the sandy bridge integrated
>> graphics plus a Nvidia Quadro NVS4200M (optimus).
>>
>> The BIOS allows to disable Optimus. This way you loose access to the
>> integrated card and may use the nvidia card (I use the latest
>> proprietary drivers). The problem with this setup is power
>> consumption. Much greater than in Windows. With Optimus enabled in
>> BIOS you can use the intel X drivers (if you block nouveau and nvidia
>> drivers) but the power consumption is still there (the nvidia card is
>> on). Also there are some problems in switching from X to console. In
>> summary, a lot of good reasons to disable the nvidia card :-)
>>
>> Unfortunately, the acpi_call method does not work. It returns "failed"
>> for all tests.
>>
>> Here is the relevant data:
>>
>> sudo dmidecode -s system-product-name
>> Latitude E6420
>>
>> sudo dmidecode -s system-version
>> 01
>>
>> lspci -vnnn | perl -lne 'print if /^\d+\:.+(\[\S+\:\S+\])/' | grep VGA
>> 00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd
>> Generation Core Processor Family Integrated Graphics Controller
>> [8086:0126] (rev 09) (prog-if 00 [VGA controller])
>> 01:00.0 VGA compatible controller [0300]: nVidia Corporation Device
>> [10de:1056] (rev a1) (prog-if 00 [VGA controller])
>>
>> In attachment the DSDT.dsl
>>
>> How may I help?
>>
>> G.
>>
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>