In case it was a kernel problem (I have also had a kernel update since I
last rebooted, from 4.15.0-42 to -43), I installed the latest HWE 18.04
kernel, but that did not help.
I should note that in fact the screen shield *does* sometimes activate;
but when it does, pressing a key reveals only the
I tried building 3.28.3-0ubuntu0.18.04.3 and installing that, but that
doesn't fix the problem, so it looks as though the cause may lie
elsewhere, in some other update that has happened in the same period.
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(The issue doesn't seem to me to be serious enough to warrant keeping
the bug private.)
** Information type changed from Private Security to Public
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https://bugs.launchpad.net/bugs/181237
