linux-kernel - Re: 2.6.19-rc[1-4]: boot fail with (lapic && on

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Date:	Wed, 01 Nov 2006 00:27:07 +0000
From:	Sergio Monteiro Basto <sergio@...giomb.no-ip.org>
To:	earny@...4u.de
Subject: Re: 2.6.19-rc[1-4]: boot fail with (lapic && on_battery)

On Tue, 2006-10-31 at 22:27 +0100, Ernst Herzberg wrote:
> With 2.6.18.x everything works fine.
> 
> But 2.16.19-rc does not boot if the laptop runs on battery _and_ lapic
> is 
> defined as boot parameter.
> 
> The kernel loads and starts, for a fraction of a second some messages
> appears,
> then the screen goes blank and nothing more happens.
> 
> 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.  

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 
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. 
Some years ago (2002/3) was a very common bug kernel try enable
automatically lapic (when BIOS don't) and computer hangs . 

-- 
Sérgio M.B.

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