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I have Y560 laptop with ATI HD5730 discrete card.

echo OFF > /sys/kernel/debug/vgaswitcheroo/switch can power off discrete card.

echo ON > /sys/kernel/debug/vgaswitcheroo/switch can enable it.

But echo DIS > /sys/kernel/debug/vgaswitcheroo/switch can not use discrete Graphics card, it always uses integrated card, unless in Bios I cancel card switch and use discrete model. But can it be hot switched in Ubuntu between discrete and integrated cards, like Windows 7?

And in the below command output: IGD:+, DIS-Audio:+ What does "+" mean there?

cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Off:0000:01:00.0
2:DIS-Audio:+:Off:0000:01:00.1
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The plus (+) sign shows the active video card. But I'm lost about the state of your "DIS-Audio" card: how can it be active when off??? I'm also curious to know how to make the Discreet Graphics card active. –  Sadi Mar 21 '13 at 17:49

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