Christopher, thanks for suggestion! I'v updated BIOS:
$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
A11
08/03/2012
But "^@" sequence generation remains. Also I've noticed that the mentioned 
sequence generated on power adapter plug/unplug.

** Changed in: linux (Ubuntu)
       Status: Expired => Incomplete

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https://bugs.launchpad.net/bugs/1063658

Title:
  Unknown "Video Bus" device continuously generates keys combination

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