Re: [2.2.2] APM poweroff problem

Nils Philippsen (
Fri, 26 Feb 1999 12:40:03 +0100 (CET)

On Fri, 26 Feb 1999, Stephen Rothwell wrote:

> This is a know bug with some BIOS implementations. They assume that
> we will switch back to real mode before we ask them to power off.
> Under Linux we do not do this.
> [I am assuming the emssages you get start with something like
> OOPS: ... f000
> ]

That's not easy to say, the square bracketed hex numbers scroll with a speed
of about 5 screens per second.

> Complain to Gigabyte.

Let's hope that this will lead to some action...

> Alternatively, someone could write me some code that (reliably) switches
> to real mode and we could call that in the power off code ...

Anyone got some pointers where to get the necessary info? What we learned at
college didn't include real<->protected mode switches and the like (hey, at
least we were the first semester to learn x86 assembler instead of the Z80 or
whatever the ones before us did learn...). I might warm up some long lost
knowledge and have my first contribution to the kernel (at a point where I
can't do much harm... good :-)


Nils Philippsen                  @college:
Vogelsangstrasse 115             @home:
D 70197 Stuttgart                phone:    +49-711-6599405
Lottery: a tax on people who are bad at math.

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