I have\had the same problem.
When I'm in inside a X session and i turn off the discrete videocard,
the wattage doesn't drop and the fan still on, but if i use:
echo DIGD > /sys/kernel/debug/vgaswitcheroo/switch
only after the suspend it works. If i put this command line inside
rc.local, it doesn't work...
https://help.ubuntu.com/community/HybridGraphics
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https://bugs.launchpad.net/bugs/916621
Title:
fan of 700Z3A is always noisy
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