It was not quite correct what I said about flickering stopping only when
mouse moves. It also stops when something is output continuously to the
terminal window. For example, running the following command in gnome-
terminal window:

perl -MTime::HiRes -E '$i=0;while (1) { $i++; Time::HiRes::sleep( 0.2 );
say "Hello $i" }'

causes the flickering to stop. However, if I increase the sleep delay
between writes to the terminal from 0.2 to 0.3 seconds, flickering
starts again. So the output must be continuous for the flickering to
stop.

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https://bugs.launchpad.net/bugs/1634451

Title:
  Screen flickers when booting ubuntu 16.10 on USB stick

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