Created attachment 694026 [details]
journalctl log

I'm running TW on an Lenovo X1 Carbon (4th Gen). Every Nth time (where N is
somewhat < 10), or after N hours (again difficult to specify) the screen
remains blank after a resume. My suspicion is that this mainly happens after I
unplug the monitor from the onelink+ dock (with 2 external monitors) and
suspend. I have tried making sure that the laptop display is running before
suspending, but the problem still persists. 

$ uname -r                                                     
4.7.4-1-default

I've attached the relevant journalctl log from just before the suspend to after
I pressed the power button to reboot the machine. 


I do see an error:
[drm:intel_display_resume [i915]] *ERROR* Restoring old state failed with -22 

which I suspect is what's happening, however I can't figure out what is causing
this.