Ok so I'm not sure if the fix is the same for everyone, but in my case the issue wasn't in the Debian install but in the laptop itself, and more precisely either in the embedded controler or in some low level firmware (e1000e or AMT I'd say).
A longer explanation for people interested is at http://www.corsac.net/index.php?rub=blog&post=1534 in case the fix might work for other people. Sorry for the bug hijack if it's completely unrelated. Regards, -- Yves-Alexis
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