Comment 5 for bug 206049

When reporting X issues, please always attach your Xorg.0.log. Also, when reporting crashes please remember to attach backtraces, because we cannot begin troubleshooting without having that info. See http://wiki.ubuntu.com/DebuggingXorg for details on this.

As I'm sure you read in bug #195843, upstream says that INTEL_BATCH=1 is not supported and can make a system less stable, so we would not consider that an acceptable fix for this issue - it might result in making your specific system more stable by default, but make everyone else's less stable. Also, I suspect INTEL_BATCH=1 may not have solved your issue, just hidden it.

It would also be good to rule out memory issues, since bad RAM can typically exhibit problems like this. Please run a memory checker to verify your memory is ok. If it is, then attach the Xorg.0.log and backtraces.