A very friendly Xorg developer made a patch for my issue, apparently my 
bluetooth keyboard exposes 4 axes but no buttons.
The first axis is the battery voltage, when that goes down the keyboard sends 
an axis event, causing Xorg to dereference a NULL pointer on the button.

I don't know for sure if this patch will fix the issue in this ticket
until I see a backtrace with debug symbols or the output of evtest on
the ps3 remote.

** Patch added: 
"0001-xfree86-Check-for-existance-of-button-class-before-d.patch"
   
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/597895/+attachment/1511873/+files/0001-xfree86-Check-for-existance-of-button-class-before-d.patch

-- 
X crashes on key press
https://bugs.launchpad.net/bugs/597895
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