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I have 2 GPU's in my netbook. How do I know which one I'm actually using at any given moment?

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2 Answers 2

Which OS are you using? If you use lspci on most linux machines you get a list of your pci devices, just grep for graphics devices and it should pop up both of them. After that just check out the config on each of them, you should see details of up/on/active or something to that nature.

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ubuntu 11.04. and lspci is showing all two gpu's. –  LanceBaynes Jul 11 '11 at 3:41
    
secguru.com/article/… That should be of substantial help to find out more details. –  Lemur Jul 11 '11 at 4:03

To check which GPU is currently in command (that means which is an active VGA controller) type in

lspci -vnnn | perl -lne 'print if /^\d+\:.+(\[\S+\:\S+\])/' | grep VGA

Any controller with [VGA controller] at the end is your currently active GPU. The others are switched off. In the following example the Intel card is active while the nVidia one is not in use:

00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor
Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA 
controller])
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF108 [GeForce
GT 540M] [10de:0df4] (rev ff) (prog-if ff)
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