I am having the exact problem on my Macbook in Jaunty too (GMA950). My backtrace on AMD64 is at http://paste.ubuntu.com/131446/ and is more or less identical to what you're seeing.
I am having the exact problem on my Macbook in Jaunty too (GMA950). My backtrace on AMD64 is at http:// paste.ubuntu. com/131446/ and is more or less identical to what you're seeing.