ubuntu-x-swat team mailing list archive

[Chris Halse Rogers <raof@xxxxxxxxxx>]

Another useful thing to try would be to see if disabling the phantom
output makes things better.

To do that you would need to access the grub menu and add “video=VGA1:d”
(if your monitor is not connected via a VGA cable) to the end of the
kernel command line.

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https://bugs.launchpad.net/bugs/681054

Title:
  screen repeatedly goes black for a fraction of a second (two monitors
  detected?)