Wow, thank you Minsang Kim! That actually works 100% perfectly for me! :) 
I also want to add, if you still want plymouth to show, it also works with: 

GRUB_CMDLINE_LINUX="quiet splash acpi_backlight=vendor"

So you don't need to remove the default options, just add the last.
Thanks again for workaround!

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brightness hotkeys don't work as expected, asus ul30a
https://bugs.launchpad.net/bugs/543294
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