Not correct suspension.

On Arch Linux on Dell Latitude 7480 (Intel i5 7th Gen) the suspension features works when i close the computer, and it wakes up when i reopen it.

While on Ubuntu LTS / Debian Stable everything worked as normal, but on Arch when the computer is suspended the display's backlight is on and there's a probability that the CPU isn't in an idle mode beacuse the fans remain pretty loud. This obvioulsy drains the battery, making imossible to really suspend the computer.

Any help?