by zeebra » Jan 10th, '18, 17:40
blacklist moduleX, for some Acer models for example, there is a WMI driver that inhibits the correct behaviours regarding power management, keyboard lights, shortkeys and touchpad. For Acer machines it might in some cases be necessary to blacklist Acer WMI in the kernel for the power management functions to work correctly. Foe example, this was necessary previously to wake suspended machines by touch of a keyboard key.
Could you drop some dmesg and journalctl -b information here?
Just try to suspend the machine, then look in the logs.
Perhaps a custom Kernel will also fix the issue, it is ALWAYS worth trying a custom slim and nice Kernel, suited to your machine. You can always use the configuration file of an installation where you KNOW the suspend function works as you expect it to work.