Marco Peereboom wrote:
You are hitting a workaround in the AML code.  HP has BIOS' that have
AML with backwards dependencies.  \\_PR_.CPU0._PPC is not in scope until
acpicpu runs, but we can't run acpicpu without acpiec.  The best part is
that it doesn't need _REG so minus an ugly warning your machine should
be working fine.

This warning is really irritating to see during boot up but I am happy that it's not anything serious. Sorry for cross posting to misc and tech, won't do it the next time.

If you have the time could you tell me from where I can start learning about low level topics like BIOS,ACPI ? I have a pretty good knowledge is programming but have very limited knowledge of hardware.

Thank you for your time,
Karthic

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