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From: Andi Kleen <ak@suse.de>
To: tglx@linutronix.de
Subject: Re: BUG lapic: Can't boot on battery (2.6.21-rc{1,2,3,4})
Date: Wed, 21 Mar 2007 10:46:19 +0100
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Cc: Grzegorz Chwesewicz <grzegorz.chwesewicz@chilan.com>,
       Stefan Prechtel <stefan.prechtel@googlemail.com>,
       linux-kernel@vger.kernel.org, mingo@elte.hu,
       Len Brown <lenb@kernel.org>, john stultz <johnstul@us.ibm.com>
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On Wednesday 21 March 2007 10:24, Thomas Gleixner wrote:
> 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 think I ran into the same problem with my initial noidletick patch.
I don't have that test machine anymore though.

Normally the "use PIT when AMD && Cstate >= 2" check should
have caught that though. Why did it here?

-Andi