The Y570 has a GPU switch on the front of the laptop, on the right side. The laptop comes with the GPU switch in the off position, and you have to move the switch to enable the GPU. Seems there are a lot of problems with that laptop and the optimus technology so this may not solve your problem.
No, it does not help. I already had it in the "on" position, and in Ubuntu I cannot even turn it off. Ty though.
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