Hey everyone,
I've just found a workaround for this problem somewhere deep in the waters of 
Internet. For me and my Asus UL20A it worked like a charm, so hopefully, it may 
be useful to some of the others here.

1) open /etc/default/grub
2) add "acpi_backlight=vendor acpi_osi=linux" to GRUB_CMDLINE_LINUX
3) run sudo update-grub 
4) restart your computer

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can't adjust the brightness of my laptop display
https://bugs.launchpad.net/bugs/570042
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