> It is entirely possible that some change triggered a BIOS(?) bug, or 
quoted text
> even that a BIOS upgrade caused the breakage, of course.

Yes, and if your testing shows what I think it will then the bug can
instead become an ACPI bug and maybe Len and the ACPI folks can work
around it.
quoted text
> 
> I'll try to try out the hardware in another Linux box - it may take a 
> while, as I have to find out who at work has liberated their machine 
> from corporate IT.  :-)

Thanks
Alan
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