Subject: Re: 2.6.19-rc[1-4]: boot fail with (lapic && on_battery)
From: Sergio Monteiro Basto <sergio@sergiomb.no-ip.org>
Reply-To: sergio@sergiomb.no-ip.org
To: earny@net4u.de
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <200610312227.54617.list-lkml@net4u.de>
References: <200610312227.54617.list-lkml@net4u.de>
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Date: Wed, 01 Nov 2006 00:27:07 +0000
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On Tue, 2006-10-31 at 22:27 +0100, Ernst Herzberg wrote:
> With 2.6.18.x everything works fine.
>=20
> But 2.16.19-rc does not boot if the laptop runs on battery _and_ lapic
> is=20
> defined as boot parameter.
>=20
> The kernel loads and starts, for a fraction of a second some messages
> appears,
> then the screen goes blank and nothing more happens.
>=20
> I'm unable to read the last message, screen blanking is to fast, but
> the
> 'picture' looks like that he stops near the messages where at the
> normal
> boot demsg "Local APIC disabled by BIOS -- you can enable it with
> "lapic""
> appears. =20

Hi,
If you don't enable lapic, you will see cat /proc/interrupts with
XT-PIC.
if you try enable lapic, somehow IRQ routing should change=20
and if /proc/interrupts still the same, with IRQs on XT-PIC.
I think, lapic still not enable and you just get problems.
Unless you know that lapic works, you should try it enable because it a
trap that just give you a problem.=20
Some years ago (2002/3) was a very common bug kernel try enable
automatically lapic (when BIOS don't) and computer hangs .=20


--=20
S=E9rgio M.B.

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