Acer 5810TZ brightness wont change

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http://www.linuxforums.org – I think the title says it all, how can I be able to change the laptop brightness via the funtion keys? volume works fine but brightness doesnt. I tried to set the "acpi_backlight=vendor" line in the kernel parameters, but that didnt help, its weird cause I used this same line in ubuntu and that worked, but with arch doesnt, any ideas? regards (HowTos)