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["Andreas E." <1374785@xxxxxxxxxxxxxxxxxx>]

Is it planned for this to appear in the current release (utopic
proposed), or is the only option to upgrade at this early stage already
to 15.04?

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https://bugs.launchpad.net/bugs/1374785

Title:
  Screen-saver fade-to-black does not cover entire screen on HiDPI

Status in Unity:
  Fix Committed
Status in Unity 7.2 series:
  In Progress
Status in unity package in Ubuntu:
  Fix Released
Status in unity source package in Trusty:
  Fix Committed

Bug description:
  [ Impact ]

  When display scaling is set to 2x or greater the fade-to-black
  animation when the screen saver is invoked covers only a fraction of
  the screen.

  [ Test Case ]

  Requires a display with 2x UI scaling (works best with a high-DPI
  display).

  The fade-to-black which occurs prior to the screen shutting off only
  covers the top left quarter of the screen.

  When scaling is set to 1x, the entire screen fades to black.

  [ Regression Potential ]

  An invalid scaling calculation (or rounding error) could result in writing outside the screen buffer bounds with resulting unknown impact.  Inpspection and code review shows this not to be the case wit this patch.
  [ Other Info ]

  The Ubuntu 14.04 LTS SRU was cherry-picked from upstream Unity where
  it has been in production use in Ubuntu 'Vivid Vervet' for some time
  and has not shown ergressions.

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