This sound like tied to the changes to the ec code which enable some callbacks 
sooner on boot. Which would make the same behaviour appear with the latest -21 
kernels from proposed.
The DSDT of you had two errors but they where somewhere in the thermal zone and 
I am not sure this gets into play that early. I attached a changed version 
anyway. Loading a custom DSDT should be fixed for Intrepid. So you just can 
give it a try.
>From the messages it seems the hang is between bus_init and ec_add which is 
>large enough to be unhelpful. I'd have to add more debugging. I would try to 
>get something together for a 2.6.26-5 kernel. But it may take a bit.

** Attachment added: "Changed DSDT"
   http://launchpadlibrarian.net/17103921/DSDT.aml

** Changed in: linux (Ubuntu)
     Assignee: Ubuntu Kernel ACPI Team (ubuntu-kernel-acpi) => Stefan Bader 
(stefan-bader-canonical)

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acpi hangs on boot
https://bugs.launchpad.net/bugs/254668
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