Tell me more ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.
up vote 2 down vote favorite

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).

share|improve this question
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

Know someone who can answer? Share a link to this question via email, Google+, Twitter, or Facebook.

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.