Comment 2 for bug 134277

By giving a quick look at the runtime libraries, I don't think the problem is related to these:

dapper:
atlas3-base (3.6.0-20)
lapack3 (3.0.20000531a-6ubuntu2)
refblas3 (1.2-8ubuntu1)

edgy:
atlas3-base (3.6.0-20.2)
lapack3 (3.0.20000531a-6ubuntu2)
refblas3 (1.2-8ubuntu1)

the only differences between the two atlas3-blase libraries being in the packaging (and of course the base libraries against which they were compiled).

Unless there is a copy&paste problem, these results:

athlon/dapper max= 2.28048070053e-16 min= -4.583786292e-16 GOOD
pentium/edgy max= 2.28048070053e-16 min= -4.583786292e-16 GOOD

seem to confirm it.
I guess in both cases you were using the 32bit version?
It could actually be an hardware problem, would it be possible to test this on the same machine with the two different versions (edgy and dapper)? Perhaps some of the test cases above covers this?