Fix Fn Key not working on Toshiba Laptop

1) Edit /etc/default/grub and change this variable:
GRUB_CMDLINE_LINUX="pcie_aspm=force acpi_osi=Linux acpi_backlight=legacy"
2) Edit /etc/modprobe.d/blacklist.conf and add this line at the end of the file:
blacklist toshiba_acpi
3) Update the grub config file:
sudo update-grub

4.) Reboot.

Source:  

Posted in: Linux, Ubuntu