The fix from xserver-xorg-video-intel (2:2.1.1-0ubuntu5) seems to work.
Many thanks.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Triaged => Fix Released
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[Gutsy] intel driver resets laptop brightness to highest mode after start,
logout or video play
https://bugs.launchpad.net/bugs/139954
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