Lenovo IdeaPad 320 laptop doesn't wake up after suspend

[Nikolas Nyby <nikolas@xxxxxxx>]

I have a Lenovo IdeaPad 320 laptop with Debian testing/buster and Linux 
4.18.5. When I close the lid and open it again, the screen is black, and 
I can't do anything. I can't even ctrl-alt-F3 to a vterm. At this point 
I need to restart the laptop every time I close the lid.

Does anyone have any suggestions how to fix this? I have 
CONFIG_SUSPEND=y set in my kernel.