How do you know whether you are on integrated graphics or the graphics card on the w520?
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Open power manager, in basic mode, there should be an NVIDIA icon if the dGPU is on. The alternative is if you notice your battery draining really quickly.
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or here:
Optimus test tools finally in users hands - LaptopVideo2Go Forums
there are two different kinds of the optimus monitoring tool
[W520] Switchable Graphics
Discussion in 'Lenovo' started by Sccrfreak, Jun 2, 2011.