The bug seems to be in qtmir and happens when we connect (and then
disconnect) an external screen:

<ltinkl> QQuickWindow::grabWindow: scene graph already in use
<ltinkl> Saving screenshot to 
"/home/phablet/Pictures/Screenshots/screenshot20160415_135440728.png"
<ltinkl> ScreenGrabber: failed to save snapshot!
<ltinkl> ^^ this after disconnecting
<greyback> grabWindow: scene graph already in use
<ltinkl> yea
<greyback> that's the rel culprit


** Also affects: qtmir (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: unity8 (Ubuntu)
       Status: In Progress => Incomplete

** Changed in: unity8 (Ubuntu)
     Assignee: Lukáš Tinkl (lukas-kde) => (unassigned)

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https://bugs.launchpad.net/bugs/1511042

Title:
  [pocket pc] Screenshots not possible

Status in Canonical Pocket Desktop:
  New
Status in qtmir package in Ubuntu:
  New
Status in unity8 package in Ubuntu:
  Incomplete

Bug description:
  using the device volume buttons in desktop mode behaves like a
  screenshot has been taken. no image is saved. The bluetooth keyboard
  i'm using has not printscreen button so this method is untested.

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https://bugs.launchpad.net/canonical-pocket-desktop/+bug/1511042/+subscriptions

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