linux-kernel - Re: BUG lapic: Can't boot on battery (2.6.21-rc{1,2,3,4})

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Message-Id: <1174475666.10840.44.camel@localhost.localdomain>
Date:	Wed, 21 Mar 2007 12:14:26 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <ak@...e.de>
Cc:	Grzegorz Chwesewicz <grzegorz.chwesewicz@...lan.com>,
	Stefan Prechtel <stefan.prechtel@...glemail.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	Len Brown <lenb@...nel.org>, john stultz <johnstul@...ibm.com>
Subject: Re: BUG lapic: Can't boot on battery (2.6.21-rc{1,2,3,4})

On Wed, 2007-03-21 at 11:37 +0100, Andi Kleen wrote:
> > The BIOS/ACPI is broken and does only expose C1, which should not switch
> > off LAPIC. The BIOS is switching into deeper C-States behind the kernels
> > back somehow.
> 
> Hmm, perhaps we can check AMD && (cstate >= 2 || has a battery) ? 
> Should be doable by looking up the battery object in ACPI

Which makes us rely on another ACPI feature. What guarantees that the
ACPI tables are correct for this one ?

	tglx


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