also having this problem with a R580
http://www.voria.org/forum/viewtopic.php?f=3&t=358&p=3216#p3216
backlight control won't work. smartdimmer and nvclock are bringing error:
Unable to shadow the video bios
Error!

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brightness hardware control on Samsung R510 doesn't work
https://bugs.launchpad.net/bugs/297962
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