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[ubuntu] Brightness always at 100%

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linux-howto

http://ubuntuforums.org – I am currently using an Acer 5742 which has various problems with brightness control. Using "acpi_backlight=vendor" in the grub line does give me back full control via the brightness keys and it does automatically dim on inactivity but the problem is the brightness is set to full all the time unless I manually alter it. Is there any way to get it to dim when on battery in unity? In Windows 7 and KDE it does this without me having to change anything, I just pull out the plug and it dims automatically but not in unity. Always 100% in unity :( (Hardware)