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SubjectRe: 2.4.22 APM problems with IBM Thinkpad's
Ruben Puettmann writes:
> On Wed, Aug 13, 2003 at 03:11:27PM +0100, Alan Cox wrote:
> > On Mer, 2003-08-13 at 14:13, Mikael Pettersson wrote:
> > > With APIC support enabled (SMP or UP_APIC), APM must be constrained:
> > > DISPLAY_BLANK off
> > > CPU_IDLE off
> > > built-in driver, not module
> >
> > This isnt sufficient because some of the SMM traps off the FN-key
> > sequences also crash thinkpads if APIC is enabled. Basically *dont use
> > local apic* except on SMP.
>
> sorry but why breaks this all under linux? O.K im not a friend if
> windows but on the preinstalled windowsXP it runs all fine.

Because Winblows typically won't attempt to use the local APIC
on uniprocessor machines.

> Is this a problem of manpower or missing spec's?

BIOS limitations or bugs (depending on your POV)

It tends to work on desktop machines but break on laptops.
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