I was also looking at the discussion on bug # 16873, which appears to be the 
same problem, but they are looking at the radeon driver side rather than the 
kernel, and they appear to have a patch that's looking promising, but it's edgy 
only at this point. But a 'stable release' (does that mean dapper?) will 
probably be made soon.
  Now this brings up a more basic question: Does the Radeon driver run as a 
kernel module, so when it crashes, it takes the kernel with it, or does it run 
in userspace?  I ask the question because if it is the latter, then fixing the 
driver would only be a circumvention, not a fix for the kernel lockups, right?  
In that case, we should keep the broken radeon driver around, and make sure the 
appropriate hardware gets to a kernel developer who  can use it to discover the 
underlying kernel bug.

-- 
Fail to boot smp kernel
https://launchpad.net/bugs/24533

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