My HP ZBook15 (Intel i5-4310M x4, graphics Intel Haswell Mobile) randomly freezes after resuming from suspend (also hibernate but let's keep it simple), after maybe 30 mins or a couple of hours. Screen stays intact, clock freezes, and mouse (touchpad) may or may not move. Ctl-Alt-Del does nothing, unsure of Caps or Num Lock toggle. I have Ubuntu 18.04.1 LTS, Gnome 3.28.2, and a whole bunch of developer tools. I have a non-HP-supplied 2TB HDD drive and no SSD. I can supply more info if someone asks, and tells me how to get it.
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