Ever since the default changed to never blanking the screen, and after I
whined in comment #18 above, I have been running this in
/etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="<other stuff> consoleblank=300 <other
stuff>"

always save a copy of grub first, and do "sudo update-grub afterwards",
then re-boot.

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https://bugs.launchpad.net/bugs/869017

Title:
  Ubuntu server enables screenblanking, concealing crashdumps (DPMS is
  not used)

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