black window when I start a 3d app

[Earthson]

I've found an error message:

$ sudo glxgears
[sudo] password for earthson:
 Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server
":0.0"
      after 33 requests (33 known processed) with 0 events remaining.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/ubuntu-users/attachments/20110518/089097d4/attachment.html>