Xlib: extension "Generic Event Extension" missing on display "localhost:11.0"

Dave Howorth dhoworth at mrc-lmb.cam.ac.uk
Tue Feb 23 15:36:20 UTC 2010

I've recently installed karmic onto a test machine and I'm presently
running programs on it via the display of my regular machine after
logging in via ssh -X.

When I run Firefox for example I see many messages like this on the
controlling terminal:
  Xlib:  extension "Generic Event Extension" missing on display

I'm wondering if anybody has come across this problem and knows how to
fix it?

My regular computer runs an embarrassingly old system so it wouldn't
surprise me if its X server is missing some feature. But an X client
should be designed to run against any X server and it certainly
shouldn't be spewing lots of repetitive messages.

I've found a little information about the error message, such as the
thread at http://ubuntuforums.org/showthread.php?t=1133105 but I have
libxcb-event1 installed on the karmic box and libxcb-event0 is not
available from the default repositories, so I suspect that thread is out
of date.

There's also a more recent redhat bug report -
https://bugzilla.redhat.com/show_bug.cgi?id=478607 - that mentions
libXext but I have the most recent version of that installed.

Thanks for any pointers,

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