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When I connect an external monitor using the DisplayPort connector on my HP ProBook 6550b, it works like a charm. However, when I *dis*connect the DisplayPort cable, the UI on the laptop freezes. Sometimes I can recover by cycling through suspend / resume, but at times this doesn't work either.

I also tried disabling the external monitor first before disconnecting, but the result is the same.

When using a VGA cable to connect the external monitor, everything works fine.

I'm using Ubuntu 11.10 64bit with Unity 2D.

I wanted to file a bug about this, but the problem is I don't know if this is related to either Unity 2D, Xorg or the Intel driver (or something else).

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put on hold as off-topic by Jorge Castro, Luis Alvarado 14 hours ago

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Bug reports and problems with the development version of Ubuntu should be reported on Launchpad so that developers can see, track and fix these issues." – Jorge Castro, Luis Alvarado
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If anyone else runs into this, I noticed that when I enter suspend before disconnecting the cable, I can resume successfully afterwards in most cases. So this could be a workaround until the issue has been fixed. –  iGadget Feb 7 '12 at 14:23
    
...and if you get a garbled screen when resuming from suspend, you can try to do a CTRL+ALT+F1, ALT+F7 cycle. In most cases I then got my screen back. –  iGadget Jun 5 '12 at 10:09
    
Are you still experiencing this problem? –  Seth Aug 31 '13 at 21:38

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