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I use the command lspci -vnnn | grep VGA and the output is

00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 18) (prog-if 00 [VGA controller])
01:00.0 VGA compatible controller [0300]: nVidia Corporation GT218 [GeForce 310M] [10de:0a70] (rev ff) (prog-if ff)

from this I can't understand whether nvidia graphic card is working or not. I was following a tutorial to switch it off but can't estimate it right now.

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You can determine which card is powered on by issuing the following command :

cat /sys/kernel/debug/vgaswitcheroo/switch

At least this works on Archlinux and documentation exists for Ubuntu

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