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 -- doesn't dim screen on sony vaio vgn fs215m (regression) https://launchpad.net/bugs/65028 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs