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Subject: Re: BUG lapic: Can't boot on battery (2.6.21-rc{1,2,3,4})
From: Thomas Gleixner <tglx@linutronix.de>
Reply-To: tglx@linutronix.de
To: Stefan Prechtel <stefan.prechtel@googlemail.com>
Cc: Andi Kleen <ak@suse.de>,
       Grzegorz Chwesewicz <grzegorz.chwesewicz@chilan.com>,
       linux-kernel@vger.kernel.org, mingo@elte.hu,
       Len Brown <lenb@kernel.org>, john stultz <johnstul@us.ibm.com>
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Date: Wed, 21 Mar 2007 14:15:29 +0100
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On Wed, 2007-03-21 at 14:04 +0100, Stefan Prechtel wrote:
> I uploaded the output of dmesg (kernel 2.6.21-rc4-git5) (battery / ac)
> and dmidecode
> I can boot on battery with nolapic_timer and the second core is online, too.
> /proc/acpi/processor/C000/ shows the same as before but
> /proc/interrupts has changed:
> 
> (battery)
>            CPU0       CPU1
>   0:      47131          0  local-APIC-edge-fasteoi   timer
> LOC:          0      46978
> 
> (ac)
>            CPU0       CPU1
>   0:      59137          0  local-APIC-edge-fasteoi   timer
> LOC:          0      58984

That's correct. We keep the PIT alive and trigger the lapic timer
interrupt via an IPI.

	tglx