Comment 10 for bug 65028

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.

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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.