linux-kernel - Re: BIOS bug, APIC version if 0 for CPU#0

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Date:	Tue, 22 Apr 2008 07:21:51 +0200
From:	Jacek Luczak <difrost.kernel@...il.com>
To:	Justin Mattock <justinmattock@...il.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: BIOS bug, APIC version if 0 for CPU#0

Hi,

> Hello;
> with the latest git on a macbook the system can barely boot without
> freezing, a work around for me at leat is either disable smp, or once
> booted  turn on glxgears,or compiling the kernel i.g. when using the
> processors I'm not receiving a freeze, only when everything starts
> lowering down. in dmesg I'm noticing BIOS bug, APIC version is 0 for
> CPU#0! fixing up to 0x10. (tell you're hw vendor) could this be the
> reason for the system freezes?,

I don't think so. On my machine there's no freezes with latest git and:
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
BIOS bug, APIC version is 0 for CPU#0! fixing up to 0x10. (tell your hw vendor)
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
BIOS bug, APIC version is 0 for CPU#0! fixing up to 0x10. (tell your hw vendor)

I've got exactly the same messages.

> also I didnt have a camera handy on me
> but the screen spit out = Bug spinlock lockup on CPU#0
> swapper/0. c17fa7c0 PID 0, comm: swapper not tainted.

Can you try to write down more of those bug messages?

> I dont have a problem disabling smp, except when I cat /proc/cpuinfo I
> don't see anything about my cores.

What exactly you expect to see in /proc/cpuinfp while smp is disabled?

> I know this is a stupid question
> but will it hurt the system if smp is disabled
> for the macbook pro ati chipset.?

No it won't.

-Jacek
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