Okay, so Fn keys do work but the acpi_video0 backlight doesn't. That's not at all uncommon on Samsung laptops. But there isn't any samsung backlight.
Can you post the output of running lsmod in a terminal so we can verify that the samsung-laptop module is actually loaded?
Okay, so Fn keys do work but the acpi_video0 backlight doesn't. That's not at all uncommon on Samsung laptops. But there isn't any samsung backlight.
Can you post the output of running lsmod in a terminal so we can verify that the samsung-laptop module is actually loaded?