From: Len Brown <len.brown@intel.com>
To: earny@net4u.de
Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: 2.6.19-rc[1-4]: boot fail with (lapic && on_battery)
Date: Tue, 14 Nov 2006 01:59:59 -0500 [thread overview]
Message-ID: <200611140159.59926.len.brown@intel.com> (raw)
In-Reply-To: <200610312227.54617.list-lkml@net4u.de>
On Tuesday 31 October 2006 16:27, Ernst Herzberg wrote:
> With 2.6.18.x everything works fine.
>
> But 2.16.19-rc does not boot if the laptop runs on battery _and_ lapic is
> defined as boot parameter.
> Local APIC disabled by BIOS -- you can enable it with "lapic"
The BIOS is advising you here that it is a bad idea to enable the LAPIC on this system.
So why are you using the "lapic" boot parameter?
If you are running an CONFIG_SMP kernel with LAPIC enabled and deep C-states
(such as are available on Thinkpads when on battery mode), you will
run into the following bug:
http://bugzilla.kernel.org/show_bug.cgi?id=7376
As this is not new, the mystery is really why you see no problems in 2.6.18.
Perhaps you can forward the contents of /proc/interrupts for 2.6.18 with "lapic"
and we can see if the timer and the LOC are in sync or not when on battery?
/proc/acpi/processor/*/power will also tell us about the C-states --
dump it for both AC and battery mode.
thanks,
-Len
prev parent reply other threads:[~2006-11-14 6:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-31 21:27 2.6.19-rc[1-4]: boot fail with (lapic && on_battery) Ernst Herzberg
2006-11-01 0:27 ` Sergio Monteiro Basto
2006-11-01 1:14 ` Sergio Monteiro Basto
2006-11-01 1:04 ` Adrian Bunk
2006-11-01 2:05 ` Ernst Herzberg
2006-11-01 2:34 ` Adrian Bunk
2006-11-01 8:14 ` Ernst Herzberg
2006-11-14 6:59 ` Len Brown [this message]
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