Re: Ctrl-Alt-Backspace kills machine not X. ACPI?

Dave Jones (davej@codemonkey.org.uk)
Wed, 4 Dec 2002 14:33:37 +0000


On Wed, Dec 04, 2002 at 02:27:19PM +0000, Alex Bennee wrote:
> I was under the impression that once Linux took over from the BIOS it
> had complete control of the system, including the interrupt/exception
> table. I am assuming some sort of interrupt or exception must be being
> generated by this keypress that runs some BIOS code.

It's likely an SMM event, which Linux doesn't even get to see.
The BIOS handles it appropriately. The chipset has a bit you can
flip to disable this 'feature', but there was a caveat iirc, something
like 'it turns itself back on every so often'. I'll let Egbert say
more about it, as he had the relevant datasheet.

Dave

-- 
| Dave Jones.        http://www.codemonkey.org.uk
| SuSE Labs
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