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Since I installed Ubuntu 11.04, one of the following things happen when I try to login:

  • I see my wallpaper and my mouse cursor, but nothing else loads. Every ~10-20 seconds, the screen goes black for about one second, then shows just my wallpaper and mouse cursor again. This happens about 60% of the time that I try to log in.
  • I see my wallpaper and my mouse cursor, but after ~10-20 seconds, the screen goes black and stays black until I turn off my computer. This happens about 15% of the time that I try to login in.
  • I see a screen like the one in the below image (open the image in a new tab to see it in greater detail). I believe it is warning about a problem with compiz or my radeon drivers. This happens about 15% of the time that I try to log in.

enter image description here

  • Login is successful. This happens about 10% of the time that I try to log in.

I see the problem both in the "Unity" session and the "Ubuntu Classic" session. It does not appear to occur in "Ubuntu Classic (no effects)", but I have not tested that exhaustively.

I am running Ubuntu 11.04 with latest updates on a Dell Studio XPS 16. My videocard is a Radeon HD 4670. The full result of sudo lshw -sanitize is here.

Does anyone know what's going on? I apologize if this is the wrong place for such a question. I thought that I should report on Launchpad bugs, but ubuntu-bug requested that I ask on this site before filing a bug.

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closed as off topic by htorque, Takkat, fossfreedom, Oli Jun 26 '11 at 9:01

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It's safe to say that you are hitting a bug. All we need to do now is to determine if that bug already has been reported or is a new one. –  htorque Jun 25 '11 at 16:08
    
There you go: bug 783458. Subscribe, mark yourself as affected by the bug. This question will be closed as askubuntu.com is the wrong platform for bugs. –  htorque Jun 25 '11 at 16:22
    
Thanks, @htorque. Out of curiosity, why does ubuntu-bug now point me to askubuntu.com? I suspected that askubuntu was the wrong platform for this question, but was thrown off by ubuntu-bug's directions. –  Matthew Jun 25 '11 at 18:48
    
I have not the slightest idea. :-) –  htorque Jun 25 '11 at 19:07
3  
I'm over-simplifying things but ubuntu-bug is trying to get users to research things as much as possible before they file a bug. While that's a noble gesture the-powers-that-be seemingly think it's better to fill up AU with bug reports before they accept a bug on LaunchPad, which is just moving the problem. In short, somebody needs to improve the language ubuntu-bug uses. I hope you get a fix, anyway. –  Oli Jun 26 '11 at 9:05