Thanks, installed kernel 4.18[0] rc3 and that seems to have fixed the
problem so far.
With regards to your question about whether it was caused by a kernel
update, I'm not sure: the computer is relatively new, and I first
noticed the issue soon after getting it. If it's helpful, the kernel
Public bug reported:
Running Ubuntu 18.04 on a Lenovo Ideapad 320. After suspending and
resuming, the screen wakes up as a mass of large blocks (several pixels
across). There is no recognizable pattern to these pixels, but they do
have the Ubuntu color palette...
The computer is unresponsive to
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