Working fine on my HP Pavilion DV3 2155mx.

I needed to add the "acpi_backlight=vendor" boot parameter.

As reported in comment #87, the gnome brightness panel does not work but
the function keys work perfectly.

Thanks, Kamal! You've fixed an issue that I've had since I first tried
Ubuntu on this laptop (9.04).

-- 
Screen brightness control fails on Dell Studio 1558
https://bugs.launchpad.net/bugs/568611
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