From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752444AbXCSTUy (ORCPT ); Mon, 19 Mar 2007 15:20:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752467AbXCSTUy (ORCPT ); Mon, 19 Mar 2007 15:20:54 -0400 Received: from www.osadl.org ([213.239.205.134]:60748 "EHLO mail.tglx.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752444AbXCSTUx (ORCPT ); Mon, 19 Mar 2007 15:20:53 -0400 Subject: Re: BUG lapic: Can't boot on battery (2.6.21-rc{1,2,3,4}) From: Thomas Gleixner Reply-To: tglx@linutronix.de To: Stefan Prechtel Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, Len Brown , Andi Kleen , john stultz In-Reply-To: References: <1174325803.13341.515.camel@localhost.localdomain> <1174326499.13341.517.camel@localhost.localdomain> Content-Type: text/plain Date: Mon, 19 Mar 2007 20:27:56 +0100 Message-Id: <1174332477.13341.561.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.6.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Stefan, On Mon, 2007-03-19 at 19:53 +0100, Stefan Prechtel wrote: > You can find the files here: > http://bugzilla.kernel.org/show_bug.cgi?id=8235 thanks for providing the data. Your ACPI tables don't provide information about the power states (C-States), but your BIOS seems to switch the CPUs into deeper power states, when it runs on battery. In those deeper power states the local APIC timers and the TSC are stopped. So the machine waits for ever on the next timer interrupt. We have a broadcast mechanism for this, which gets activated from ACPI, but the broadcast mechanism is not activated: [ 3.798000] Clock Event Device: pit .... [ 3.798000] tick_broadcast_mask: 00000000 Can you please boot with 2.6.20 or earlier and check the output of /proc/interrupts ? IRQ#0 and the LOC (local APIC timer) Interrupts should increment in the same frequency. tglx