Comment 26 for bug 1240848

To be clear: I removed the file before rebooting, but it got regenerated and refilled at a furious pace, with the same message: _xgeWireToEvent: Unknown extension 148, this should never happen.

At that time, "top" was reporting upstart as the most process, obviously caught in an infinite loop throwing this erroor about the extension 148.

It seems like this is the bug:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1369113

And it seems that the spamming, at least, would be removed with an upgrade of libXext to 1.3.3. Or at least, it would be nice to backport the relevant patch

http://patchwork.freedesktop.org/patch/22124/