Hi Leann,
The first part of your question will be easy to answer, in 2.6.27-6.9, which is 
the last of the 27-6 it was still working.
But on the very first of 27-7, which was 2.6.27-7.10 I think, it wasn't, and it 
still doesn't work on 2.6.27-7.13.
So I'm pretty sure it was some patch introduced in the 2.6.27-7.10 version.
As to the second part of your question, I can try to do git bisect myself, it 
will probably take me until the begging of the next week, but I should try 
nevertheless.
However, should you prefer a more quick solution, I suspect that the offending 
patch is this one:
linux (2.6.27-7.10) intrepid; urgency=low

  [ Alexey Starikovskiy ]

  * SAUCE: ACPI: EC: do transaction from interrupt context
    - LP: #277802

you can see the original here:
http://lkml.org/lkml/2008/10/11/43


My suspicion with this patch is because I know that on this line of laptops 
from MSI, the BIOS EC region is not standard compliant, as you can see in the 
following:
http://bugzilla.kernel.org/show_bug.cgi?id=9697
and
http://bugzilla.kernel.org/show_bug.cgi?id=9627

So there is a good chance that this specific patch by Alexey Starikovskiy is 
the problematic one, as it is the only one I saw that changes the ACPI EC 
directly.
So if you are not too busy :) and have the opportunity to create a kernel 
without this patch before I do, please let me know and I will try it.
Thanks a lot.

-- 
battery and thermal dissappears after few minutes of booting. on msi ex600 
laptop
https://bugs.launchpad.net/bugs/286169
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