Do you have the CONFIG_SAMSUNG_LAPTOP kernel option enabled? I believe that this kernel option is required for full functionality out of the samsung-tools package, at least it was on my 740.
You need to make sure that you have installed linux without uefi, as due to the current bricking potential of samsung laptops running uefi, the samsung-laptop module is blacklisted if uefi is detected.
On Ubuntu, I believe you can check your kernel config for this option with:
cat /boot/config-$(uname -r) | grep CONFIG_SAMSUNG_LAPTOP
Personally, my 740 is running gentoo ~amd64. I had a heck of a time navigating the google for good information on this model - it is just way too new.