Comment 8 for bug 254668

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Stefan Bader (smb) wrote : Re: acpi hangs on boot

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.