Lenovo Y460 Intel core i3 and ATI Radeon 5650

https://help.ubuntu.com/community/HybridGraphics

there is three steps in the process:


echo ON > /sys/kernel/debug/vgaswitcheroo/switch # use all graphics
echo IGD > /sys/kernel/debug/vgaswitcheroo/switch # open IGD
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch # close DIS

unfortunately, it does not work because /sys could not be write before
it had been mounted with debugfs, so, I don't know how to the author
could make it works.

so, how to make it works?

Thanks help.

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