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

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Date:	Wed, 01 Nov 2006 01:14:08 +0000
From:	Sergio Monteiro Basto <sergio@...giomb.no-ip.org>
To:	earny@...4u.de
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.19-rc[1-4]: boot fail with (lapic && on_battery)

On Wed, 2006-11-01 at 00:27 +0000, Sergio Monteiro Basto wrote:
> 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 . 
> 
> 

s/you should try/you shouldn't try/


-- 
Sérgio M.B.

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