I see the same problem on Trusty 14.04.1 LTS.
I have a VGA monitor on the left, and an HDMI monitor on the right, and a
laptop screen that is turned off since I can't seem to run 3 displays at once.
The HDMI goes to sleep after 2 hours of inactivity.
It doesn't happen every time, but after several of these sleep cycles, a
window like psensor or Totem will often disappear as described.
xrandr snippets:
Screen 0: minimum 320 x 200, current 3600 x 1108, maximum 32767 x 32767
LVDS1 connected (normal left inverted right x axis y axis)
VGA1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
520mm x 290mm
HDMI1 connected 1680x1050+1920+58 (normal left inverted right x axis y axis)
1060mm x 626mm
** Changed in: unity (Ubuntu)
Status: Invalid => Confirmed
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https://bugs.launchpad.net/bugs/1126221
Title:
Switching from multiple to one screen causes windows to go missing
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