Description:
Using a HP Zbook 14(i7-4600U + FirePro M4100) the laptop will function as normal but when put to sleep it will take a bit longer to actually enter sleep and fails to start back up. When woken up it will only show a blank screen with a stationary cursor. The caps lock led will function for a bit and it seems to try and switch vt's(screen just blanks and then the cursor is gone too), but this only seems to work for a certain number of key strokes, after that the machine is completely unresponsive and needs a hard power off.
This happened after updating to both 4.0.1 and 4.0.2. After rolling back to 3.19.2 suspend works just fine again.

Other strange happenings:
Exactly 3 (random) times the laptop did come out of sleep ok. There didn't seem to be any rhyme or reason and I could not reproduce this even once.
In a few instances the laptop would seem to suspend but never actually powered off.
Battery life seemed to be worse too, though I did not directly measure this and it may have just been a symptom of never sleeping when idle..


Additional info:
I didn't see anything helpful in the logs. If there's some other place I should look just let me know:
May 06 23:24:15 ZeeBook systemd[1]: Starting Sleep.
May 06 23:24:15 ZeeBook systemd[1]: Starting Suspend...
May 06 23:24:15 ZeeBook systemd-sleep[1400]: Suspending system...
-- Reboot --
May 07 08:08:02 ZeeBook systemd-journal[136]: Runtime journal is using 8.0M (max allowed 773.8M, trying to leave 1.1G free of 7.5G available → current limit 773.8M).


Steps to reproduce:
Suspend the laptop, the try to wake it. :)