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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - optimus don't use nouveau card"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=64746#c7">Comment # 7</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - optimus don't use nouveau card"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=64746">bug 64746</a>
              from <span class="vcard"><a class="email" href="mailto:marccollin7379@gmail.com" title="Marc Collin <marccollin7379@gmail.com>"> <span class="fn">Marc Collin</span></a>
</span></b>
        <pre>cat /sys/kernel/debug/vgaswitcheroo/switch 
0:DIS: :Pwr:0000:01:00.0
1:IGD:+:Pwr:0000:00:02.0

don't seem switched?

i tried
echo DIS > /sys/kernel/debug/vgaswitcheroo/switch

but the screen get completly black...

so i switched back with 
echo IGD > /sys/kernel/debug/vgaswitcheroo/switch</pre>
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