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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: Grzegorz Chwesewicz <grzegorz.chwesewicz@chilan.com>
Cc: Stefan Prechtel <stefan.prechtel@googlemail.com>,
       linux-kernel@vger.kernel.org, mingo@elte.hu,
       Len Brown <lenb@kernel.org>, Andi Kleen <ak@suse.de>,
       john stultz <johnstul@us.ibm.com>
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Date: Wed, 21 Mar 2007 10:24:07 +0100
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On Tue, 2007-03-20 at 17:47 +0100, Grzegorz Chwesewicz wrote:
> I have HP nx6325. I've tried to use WARN_ON_ONCE patch, but I don't see
> nothing special in dmesg. Just in case I'm posting my
> dmesg_2.6.20_WARN_ON_ONCE_on_battery log on
> http://bugzilla.kernel.org/show_bug.cgi?id=8235 .
> 
> Below I post output of my /proc interrupts (10 sec. delay between reads).
>
> Other interesting thing on 2.6-git is that when I press a key on keyboard it
> doesn't repeat (on battery), but it repeats on 2.6-git on ac.

Sigh. The periodic PIT interrupt pampers over the problem in <2.6.21-rc.
It prevents the BIOS to switch the CPU in lower power states.

I'm working on a detect LAPIC / BIOS madness check.

	tglx