linux-kernel - Re: fc6 kernel 2.6.18-1.2798 breaks acpi on HP laptop n5430

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Date:	Thu, 02 Nov 2006 14:47:40 +0000
From:	Sergio Monteiro Basto <sergio@...giomb.no-ip.org>
To:	Stephen.Clark@...lark.us
Cc:	Dave Jones <davej@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: fc6 kernel 2.6.18-1.2798 breaks acpi on HP laptop n5430

On Thu, 2006-11-02 at 09:40 -0500, Stephen Clark wrote:
> Sergio Monteiro Basto wrote:
> 
> >On Wed, 2006-11-01 at 22:03 -0500, Dave Jones wrote:
> >  
> >
> >>On Wed, Nov 01, 2006 at 08:08:31PM -0500, Stephen Clark wrote:
> >>
> >> > booting without lapic allowed it to boot but now I get
> >> > ...
> >> > Local APIC disabled by BIOS -- you can enable it with "lapic"
> >> > ...
> >> > Local APIC not detected. Using dummy APIC emulation.
> >> >   which means more processor overhead - right?
> >> > 
> >> > also cpuspeed doesn't work anymore - I don't have a cpufreq dir
> >>
> >>The Duron had powernow ?
> >>    
> >>
> >
> >This story of trying enable lapic when BIOS don't, has been triggered on
> >kernel2.6.18, but in my opinion is not a bug if lapic on those computers
> >don't work.
> >
> >If you boot without enable lapic, you will see cat /proc/interrupts with
> >interrupts in XT-PIC.
> >if you try enable lapic, somehow IRQ routing should change 
> >and if /proc/interrupts still the same, with IRQs in XT-PIC.
> >I think, lapic still not enabled and the most you can get it's problems.
> >Unless you know that lapic works (it is programmed and BIOS wrongly
> >disable it), you shouldn't try enable lapic because it is probable that
> >just give problems, to you. 
> >Historically: In 2002/3 was a very common bug, when kernel was compiled
> >to support lapic and try enable lapic (even when BIOS don't) and
> >computer hangs on boot. 
> >  
> >
> Loading the correct kernel arch 686 - fixes my powernow problems - this 
> is a mobile duron.
> 
> Booting with lapic worked fine on  fc5 kernel-2.6.18-2200 but it causes 
> fc6 kernel-2.6.18-2798
> to hang.

With lapic boot option enabled, have you a different /proc/interrupts ? 
have you lapic working ? 


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