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 09:40:18 -0500
From:	Stephen Clark <Stephen.Clark@...lark.us>
To:	sergio@...giomb.no-ip.org
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

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.



-- 

"They that give up essential liberty to obtain temporary safety, 
deserve neither liberty nor safety."  (Ben Franklin)

"The course of history shows that as a government grows, liberty 
decreases."  (Thomas Jefferson)



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