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Disabling wifi to save battery



Hi, 

I've recently purchased a Dell vostro 3350 laptop, and to save battery,
I was planning to disable wifi, when it wasn't required. On my old
laptop I could use the rfkill package like so:
rfkill block wifi 

But it seems to have no effect on my Dell. The wifi hot key on the
laptop does not seem to work either (from the console). Does anyone have
any other ideas? If I do ifdown eth1 to bring down wifi, is it likely
the wifi will still be consuming significant battery? 

Thanks for any help,
Dan


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