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ubuntu 12.04.2 lts nvidia optimus issue

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http://askubuntu.com – I have installed on my system (dell XPS L702x) ubuntu 12.04.2 lts. My system has the nvidia optimus and I am not able to install optimus in order to avoid fan loud and other things like very short battery life. I typed lspci -vmk | grep -A 8 -B 2 VGA in order to see what driver are used for the hardware, the result of the command is the following: Device: 00:02.0 Class: VGA compatible controller Vendor: Intel Corporation Device: 2nd Generation Core Processor Family Integrated Graphics Controller SVendor: Dell SDevice: Device 0571 Rev: 09 Driver: i915 Module: i915 -- Device: 01:00. (HowTos)