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I have Asus U41S notebook with 2 wideocards, Intel HD Graphics 3000 and GeForce GT540M. I want to turn off the GF videocard, and work only with Intel.

On the internet I found out how to do this with vga_switcheroo :

  1. lspci | grep VGA to see what number have my videocards
  2. cat /sys/kernel/debug/vgaswitcheroo/switch to see what for videocard is active

but terminal says that it can't find locations of /vgaswitcheroo/switch. What must I do?

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vga_switcheroo is broken for newer NVIDIA Optimus hardware (this is fixed in kernel 3.3). It currently does not survive suspend either (the card remains on after suspend and cannot be disabled/enabled without locking up the system).

I suggest you to take a look at Bumblebee. Since version 3.0, a new power saving feature has been added which can safely disable your discrete video card. More information about this can be found on How well do laptops with Nvidia Optimus work?

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