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My notebook is a Sony Vaio VPC-Z13M9E. It has hybrid graphics (Intel HD + nvidia). I've set nvidia as the card to use, in both BIOS and the physical slider, so I have proper 3D graphics acceleration in Yosemite. Fn keys for the brightness are not working however, and there isn't any slider in...

I selected the boot arg -v to see what happens, however in the last line it shows the Prohibitory Symbol and the entire screen scrambles and can't see last line. Any way to see the complete log in a file, if that is possible?