Could it be:
acpi_backlight= [HW,ACPI]
acpi_backlight=vendor
acpi_backlight=video
If set to vendor, prefer vendor specific driver
(e.g. thinkpad_acpi, sony_acpi, etc.) instead
of the ACPI video.ko driver.
rather than acpi_brightness ?
which I don't find in:
http://www.kernel.org/doc/Documentation/kernel-parameters.txt
Also, is it the brightness control you were using from
http://library.gnome.org/users/gnome-power-manager/stable/applets-
general.html.en ?
** Changed in: gnome-power-manager (Ubuntu)
Status: Invalid => Incomplete
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g-p-m brightness not applied anymore after rebooting
https://bugs.launchpad.net/bugs/503577
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