The issue for me was not due to resuming from hibernate or suspend.  The
issue persisted after disabling both.

Monitor would go black in ten minutes but power the light was not
blinking (steady) yet upon resume I get the same graphical freeze.

Purging xautolock->reboot solved the issue for me.  Screen still goes
black in 10 minutes but I've resumed successfully several times in the
last 24 hours with no repeat occurrence.

I know this isn't a fix but thought it would be worth posting the
possibility of an alt root cause.

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  Ubuntu 16.04: Suspend freezes the system after upgrade to linux image

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