When my laptop comes out of sleep, there are thick black edges appear behind each window. This happens to all UI elements which cast a shadow, like some dropdowns an textbox suggestions.

These thick black edges do not go away until I restart laptop. I had upgraded from ubuntu 13.10 to 14.04 when this problem started occurring. I have installed all updates, but still this issue persists. Has anyone faced this problem before and found any solution?

My laptop model is HP pavilion dv-7t 3000 and graphics card model is NVidia GeForce GT 230M (N10P-GE).


The bug and a workaround is described on https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1292830 (you can check it out for more details).


  1. Press Ctrl+Alt+F2 (Warning: you will be sent to a text console where you won't be able to read this document).
  2. Press Ctrl+Alt+F7.

Once the workaround has been applied the problem no longer seems to occur on next suspend/resume.

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