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 -- g-p-m brightness not applied anymore after rebooting https://bugs.launchpad.net/bugs/503577 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs