my small workaround to change the brightness:

1. ctrl+alt+F1
2. type user und password
3. sudo -s
4. echo -n xx > /proc/acpi/video/NVID/LCD/brightness
5. ctrl+alt+F7

*4. f.e. xx = 30

-- 
Screen brightness doesn't work with Samsung R70 T7300 Despina
https://bugs.launchpad.net/bugs/219116
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