It looks like this wasn't actually enabled in the 1.11.4-0ubuntu8
package:

http://anonscm.debian.org/gitweb/?p=pkg-xorg/xserver/xorg-
server.git;a=commitdiff;h=d8e24bf6634b0ef80a21ac1d1b13412d88aa7800;hp=3a70935e497c908419a2704e699e615d148718d3

This has been fixed in this packaging commit, and will be applied for
1.11.4-0ubuntu11:

http://anonscm.debian.org/gitweb/?p=pkg-xorg/xserver/xorg-
server.git;a=commitdiff;h=5042d16f315953b76dc59a6d8063638a42f23b18;hp=362e84eae058b86a7a67b8993d0a1a2b57fac9a1

** Changed in: xorg-server (Ubuntu Precise)
       Status: Fix Released => Fix Committed

** Description changed:

+ SRU Criteria
+ ============
+ [Impact]
+ The X server may crash after connecting a bluetooth keyboard.
+ 
+ [Development Fix]
+ The Q series is not open for development yet.
+ 
+ [Stable Fix]
+ Please see the attached patch midispcur.c.patch.
+ 
+ [Test Case]
+ Connect a bluetooth keyboard and use it for five minutes. Check if X server 
has crashed.
+ 
+ [Regression Potential]
+ Low. The patch merely short circuits code that may dereference a NULL 
pointer. It is possible that this causes a further issue, but such an issue is 
likely to be at worst just as bad as without this fix.
+ 
+ Original Bug Report
+ ===================
  X crashes after connect bluetooth keyboard.
  With bluetooth mouse everything ok, crash only when i connect keyboard.
  
  After connecting the keyboard works and i can use it. Failure occurs in
  the interval between 30 seconds and 5 minutes after connecting. It does
  not depend on whether I'm typing on a keyboard or not.
  
  On Ubuntu Lucid same error
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: xserver-xorg 1:7.6+7ubuntu7.1
  ProcVersionSignature: Ubuntu 3.0.0-15.26-generic 3.0.13
  Uname: Linux 3.0.0-15-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  Date: Sun Feb 12 16:08:39 2012
  InstallationMedia: Ubuntu 11.10 "Oneiric" - Build i386 LIVE Binary 
20120208-10:12
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/930936

Title:
  Xorg crashes after connect bluetooth keyboard

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