Thanks for that - the Xorg log contains a backtrace, which is a useful pointer. There are a couple of upstream bugs with a similar looking backtrace, and a couple of Fedora bugs. Would it be possible to get a full gdb backtrace so we can disambiguate? Instructions to do this from a LiveCD are here: https://wiki.ubuntu.com/X/Backtracing#Backtracing Using LiveCD
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