Toshiba Satellite L845
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Fixing Fn Keys
If the Fn Keys do not work or exhibit incorrect behavior(e.g brightness keys suspending the laptop) it can be fixed doing the following:
In /etc/default/grub find the line that says GRUB_CMDLINE_LINUX="" and add the following kernel parameters:
acpi_osi=Linux acpi_backlight=vendor
Then, in /etc/modprobe.d/blacklist.conf add the following line:
blacklist toshiba_acpi
If blacklist.conf doesn't exist, create it.
Finally do sudo update-grub and reboot.