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[Andrea Azzarone <1350982@xxxxxxxxxxxxxxxxxx>]

Can you get a stacktrace?

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https://bugs.launchpad.net/bugs/1350982

Title:
  Unity Crashes on Resume From Suspend When Display is Attached While in
  Suspend

Status in Unity:
  New
Status in “unity” package in Ubuntu:
  New

Bug description:
  Background:

  The affected machine is a Asus Q501LA laptop with no discrete graphics card.
  CPU is a i5-4200U and the on-die graphics is an Intel HD 4400.
  External monitor is a PB278Q connected via the HDMI port on the laptop; it's resolution is 2560 x 1440.

  
  Description of the problem:

  The machine recognizes the monitor, flashes black for a moment, and
  then displays a tiled copy of the log in screen across both monitors.
  Bluetooth touchpad is functional, but clicking any copy of the "gear"
  power management icons does nothing, and I cannot type in the password
  prompt. Only workarounds are hard restart, or drop to tty and restart
  lightdm.

  
  Misc. Additional information:

  Monitor is set up to the right of the laptop, with the monitor
  adjusted so that it's bottom edge is flush with the bottom edge of the
  laptop- that's mirrored in software. The monitor's vertical resolution
  is taller, so there's "empty space" above the top of the laptop's
  screen. In screenshots it's black (example attached.)

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