Jun  1 14:07:00 over9000 kernel: [17520.804327] show_signal_msg: 27 callbacks 
suppressed
Jun  1 14:07:00 over9000 kernel: [17520.804332] polkit-gnome-au[1631]: segfault 
at 2007534 ip 00007fc14f6d09d8 sp 00007fffe6387bf0 error 4 in 
libglib-2.0.so.0.2800.6[7fc14f6a9000+ed000]
Jun  1 14:07:12 over9000 kernel: [17533.027882] eclipse[10408] trap divide 
error ip:7f97851f0788 sp:7fffc5495e40 error:0 in 
libgtk-x11-2.0.so.0.2400.4[7f97850c5000+436000]
Jun  1 14:11:25 over9000 kernel: [17786.054458] HDMI hot plug event: Pin=5 
Presence_Detect=1 ELD_Valid=0
Jun  1 14:11:26 over9000 kernel: [17786.475289] 
[drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
Jun  1 14:13:07 over9000 kernel: [17888.078536] [drm:ironlake_crtc_disable] 
*ERROR* failed to disable transcoder
Jun  1 14:13:08 over9000 kernel: [17888.562827] 
[drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting

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https://bugs.launchpad.net/bugs/790126

Title:
  iMac connected to MacBook in Target Display Mode shows black screen

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