hybrid-graphics-linux team mailing list archive

[Gianpaolo Cugola <gianpaoloc@xxxxxxxxx>]

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.