Wifi does not work out of box, because you need to installAUR driver.
Even then the LED for wifi does not work, eveh when pressing the keyboard combo for enabling/disabling it.
You can not change backlight brightness value with keyboard combo, buttons are not mapped at all (fn + F5 / fn + F6), until you use the kernel parameter
acpi_osi= acpi_backlight=native to your bootloader.
acpi_osi= it's indeed followed by a blank space +
acpi_backlight=native. This is only way when backlight can be controled with keyboard combo keys.