High X CPU issues are almost always due to bugs in client programs where
they make too many X requests (e.g. stuck in a loop).  The fact that
updating firefox resolved it for you supports this hypothesis.

Presumably a patch in the newer firefox solved it.

** Package changed: xserver-xorg-video-intel (Ubuntu) => firefox
(Ubuntu)

** Changed in: firefox (Ubuntu)
       Status: New => Triaged

** Summary changed:

- Xorg freeze
+ Firefox causing 100% X CPU load [Lucid]

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/872744

Title:
  Firefox causing 100% X CPU load [Lucid]

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/872744/+subscriptions

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