Breakage on Asus UX21A after recent upgrade

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https://bbs.archlinux.org – Now this is really getting weird: I reinstalled the actual kernel 3.9.2, but this time I booted the machine with AC power, -- and everythings works as before, all the function keys, no maxing of backlight.Shut down the  machine and booting on battery power: same breakage as described in my original post!Booting, or not, with the machine plugged in triggers the error!Hints anyone? gen2arch https://bbs.archlinux.org/profile.php?id=71378 2013-05-17T07:14:31Z (HowTos)