For me updating to the 4.8 kernel fixed this issue but gave me another suspend 
related issue which I reported here:
https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1699436

I eventually gave up on it and switched to using hibernate.
sudo pm-hibernate
or
sudo pm-suspend-hybrid

If these work for you there are instructions online for removing suspend
from the GUI menu and adding hibernate.

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https://bugs.launchpad.net/bugs/1573959

Title:
  On-screen text disappears after suspend

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https://bugs.launchpad.net/ubuntu/+source/linux-lts-xenial/+bug/1573959/+subscriptions

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