Mac Pro won't wake up from sleep via Wacom Intuos Pro

Hi there, for a few month now I'm working with a new Wacom Intuos Pro L on a Mac Pro 5,1 running 10.11.6. However one thing is bothering me. On my old Wacom Intuos Pro 3 I could wake the Mac Pro from sleep. With the new one this doesn't work anymore and I have to press a key on the keyboard to wake the Mac from sleep. The Wacom driver is 6.3.34-2. Any ideas? TIA!