Colin

Thanks very much for all the info.  I had a look into my BIOS version,
saw that it was A01 and A08 is available.  I excitedly upgraded but it's
not fixed this problem :(

I know absolutely nothing about DSDT so I am going to leave the
acpi=noirq on my menu.lst for now, I need my laptop working for
Launchpad development :)

I still consider this a kernel bug because:
a) It happened under gutsy but was controlled by blacklisting yenta_socket.  
This workaround no longer works for hardy and the problem is in fact a lot 
worse.
b) The "broken" DSDT doesn't cause problems when Vista is booted on the same 
laptop.  Yeah I know - as much as I tried to convince Dell to give me a bare 
laptop they wouldn't :)

Cheers

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Powertop reports huge number of wakeups and drains battery
https://bugs.launchpad.net/bugs/145377
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