UPDATE: I edited /etc/default/grub and added "acpi_osi=" like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_osi="
Now everything works!
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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Fn brightness keys on Toshiba Satellite A300 don't work at all
https://bugs.launchpad.net/bugs/297658
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