Summary: on reinstall on same CPU/motherboard/etc (only storage
changed), bug no longer observed.

Hello,

After observing problems on the main storage of the laptop where the bug
was observed, I bought a new storage and installed Ubuntu 16.04 from
scratch on the new storage but the same laptop.

Surprisingly, this bug **no longer happens**, but another one happens
instead, which is much less of a problem.  The new bug symptom is: after
lock/unlock, the mouse pointer no longer appears.  Mouse features
actually work, as one can see hover effects on buttons and menu items,
semi-blindly click, etc.  An efficient workaround is to press Ctrl-
Alt-F1 then Ctrl-Alt-F7, and voilĂ  mouse pointer is back again.

LC_ALL=C lshw -c video 2>/dev/null | grep configuration

       configuration: driver=nouveau latency=0
       configuration: driver=i915 latency=0

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https://bugs.launchpad.net/bugs/1547077

Title:
  Suspend to ram causes some glyphs to draw consistently wrong or even
  appear blank in gtk/gdk/pango/cairo apps. xterm/xmessage unaffected.

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