Comment 7 for bug 318261

I think the root cause here is that something lower level than X (kernel? hal?) is providing a null input device some times. X wasn't prepared for handling that so was crashing. We fixed the crash in X, but it still leaves the question of why the input device was null to begin with.

The fact that xev is giving no output indicates that the error definitely is below X, but further analysis will be needed to find what that is. It may be the kernel, but I'm refiling against hal since that's the next layer down.

@Gina, Tomasso, and tvst, maybe you have the same issue as Matt, maybe not. I would encourage each of you to refer to http://wiki.ubuntu.com/Hotkeys for guidance in debugging your issues, and would recommend you each file your own bugs against hal after doing so. (If it does turn out you have the same problem, a bug triager can quite easily mark them as dupes.)