The workaround from #42 seems to make the hard lockup less frequent for
me, but it's not completely gone. I still experience a complete freeze
from time to time. It's completely aleatory, and it doesn't seem related
to the workload, although I suspect that it's related to powersaving.
>From my experience, the probability of being hit by the freeze increases
around a standby or resume event, or around plugging / unplugging the
laptop.

When the hardlock occurs, the only thing I can do is to turn off the
laptop by long-pressing the power button. I can't switch to a virtual
tty, I can't reach the machine via SSH, REISUB doesn't work, etc.

Upon restarting, there's absolutely nothing in the kernel logs that
could be remotely related to the lockup. In fact, many times the last
entry in `journalctl -b -1` is from several minutes *before* the lockup.

I suspected of a hardware problem for a while, but the fact that every
hardware test I've run finds nothing, coupled with the fact that the
frequency of the freeze has *definitely* decreased with successive
Ubuntu/kernel/mesa versions convinced me otherwise.

My specs:
 - Lenovo ThinkPad T470s
 - Intel Core i5-7200U (Kaby Lake)
 - Intel HD Graphics 620 (rev 02)
 - Currenly on Ubuntu 18.10, kernel 4.18.0-17-generic, although for me this bug 
has been present ever since Ubuntu 17.10, kernel 4.13

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https://bugs.launchpad.net/bugs/1798961

Title:
  Random unrecoverable freezes on Ubuntu 18.10

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