The workaround in comment 6 in this thread works for my Vaio VGN-B3XP.
This isn't really a bug with gnome-power-manager IMO: it's a bug with
the hal deb. I've enclosed a patch against hal_0.5.7.1 which appears to
fix it for me.
--
If you're an ordinary user and you just want to mend a running edgy so
that backlight dimming when on battery works on a Sony laptop, just
replace
$((value + 1))
in /usr/share/hal/scripts/hal-system-lcd-set-brightness with:
$(($value + 1))
and that should fix it. You'll need admin rights to do this: open a
terminal and type
sudo gedit /usr/share/hal/scripts/hal-system-lcd-set-brightness
and press return. Then make the change above, save, and quit. The change
should take effect immediately.
** Attachment added: "Fix a bashism"
http://librarian.launchpad.net/4947653/hal-0.5.7.1_sonybrightness_bashism.diff
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doesn't dim screen on SONY VAIO (vgn FS215M / Z1 RMP) (regression)
https://launchpad.net/bugs/65028
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