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Use vga switcheroo on MacBook Pro 8,2?

I have used the instructions provided by tomodachi here to get EFI kernel stub booting working properly. The Radeon card is now properly initialized and lspci is showing both graphics cards, which is ...
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vgaswitcheroo isn't working in Ubuntu 12.04

I always used vgaswitcheroo to turn off my discrete graphic, I did a script to turn off in boot, but now, vgaswitcheroo isn't working anymore, I don't know why... look ...
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how to install swichable radoen hd 6470M drivers for ubuntu 12.04 LTS [duplicate]

Possible Duplicate: ATI 6470m & intel HD graphics 3000 drivers? i have hp pavilion g6 i5 laptop with Radoen hd 6470M switchable VGA. i installed it the Ubuntu 12.04 LTS but VGA drivers ...