Comment 16 for bug 1661741

Jonathan,
let me add more info.
The issue could be seen on kernels: 4.4, 4.11, 4.13.
Then I've tested your idea and in fact it heklped i.e. it works now.

What I've noticed also that the suspend was working fine when the laptop was in the docking station, as soon as I took it out, suspend wasn't working properly.