Errata ROSA Desktop R3

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The keys to control brightness do not work on Samsung N100 laptop

This may affect other laptops as well.

Solution: add 'acpi_backlight=vendor' kernel parameter at boot time (without quotes). To make it persistent, edit /etc/default/grub: specify that parameter in the GRUB_CMDLINE_LINUX_DEFAULT variable. Then, execute update-grub2.