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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