It looks like this is more generic regression on multiple Sony laptops. See duplicate bug 67074 where the problem is on Sony FJ170 .
** Changed in: gnome-power-manager (Ubuntu)
Importance: Undecided => Medium
Status: Unconfirmed => Confirmed
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doesn't dim screen on sony vaio vgn fs215m (regression)
https://launchpad.net/bugs/65028
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