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I wonder what could cause this problem.

about 1/10 times when plugging in the AC adapter into my Zenbook, the laptop completely loses power.

I always plug in the cable into the outlet first, as I've heard that could cause problems like this.

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I experience exactly same. Test please that these 1/10 are when your battery is less than 15%. In my case if battery level is low (15% and less) in 100% cases the laptop switches off after 1-4 seconds after I plug the power.

As a workaround I close the lid (to send it to sleep), plug the power and open back, but this is very annoying!

I use Ubuntu 11.10 with lates updates. It was from the very beginning. My brother have same laptop manufactured slightly earlier and had never experienced these problems.

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yes. After I posted this thread, I noticed that it's only when battery is low (not sure which %, but 15% sounds about right). I have a UX31 from releaseday and running Arch Linux –  SkaveRat Jun 9 '12 at 15:04
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