Backlight Fedora 18 Acer Aspire

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http://forums.fedoraforum.org – I have an Acer Aspire E1-531 and use Fedora 18. I can't adjust the display brightness. In the /sys/class/backlight/acpi_video0/actual_brightness seems to be changed, but the brightness don't change in reality. It's the same for the Fn+Left/Right and the System settings/Brightness. I tried the xbacklight, but didn't help. Linux jucus.locale 3.8.5-201.fc18.i686 #1 SMP Thu Mar 28 21:59:40 UTC 2013 i686 i686 i386 GNU/Linux 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09) 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core (HowTos)