Hello John,
> Thanks for the suggestion. I didn't see anything related to SMM in the
> BIOS menus. However, the system has real-time constraints. Thus, I'd
> turn SMM off if I knew how :-)
Here you can find a driver that can disable and enable the SMI
interrupt in the chipset. It supports up to the ICH5 chipsets, but by
adding the proper device/vendor IDs you can also make it support newer
chipsets.
http://www.bohmer.net/smi.tar.bz2
> AFAIU, poweroff is equivalent to halt -p
You are right.
Kind Regards,
Remy
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