linux-kernel - Re: 2.6.19-rc <-> ThinkPads

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Message-Id: <200610312215.44454.len.brown@intel.com>
Date:	Tue, 31 Oct 2006 22:15:43 -0500
From:	Len Brown <len.brown@...el.com>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Hugh Dickins <hugh@...itas.com>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Pavel Machek <pavel@...e.cz>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org, linux-pm@...l.org,
	Martin Lorenz <martin@...enz.eu.org>
Subject: Re: 2.6.19-rc <-> ThinkPads

The BIOS disables the LAPIC for a reason.
A couple of years ago Linux made the mistake of enabling the LAPIC
that the BIOS disabled, and all hell broke loose.
We fixed that bug about a year ago, but left "lapic"
to force it on for those where forcing it to be enabled actually
works (eg. some folks want the NMI profiling on their IOAPIC-less  laptop)

But if you force the lapic to be enabled, you are running the system
in a mode not supported by the manufacturer and you are on your own.

I don't see an indication that this is a bug.
If it used to work and it is important to you,
 then run the old software where it used to work --
because chances are good that it worked by accident.

-Len

On Tuesday 31 October 2006 22:01, Adrian Bunk wrote:
> FYI:
> 
> Subject    : Thinkpad R50p: boot fail with (lapic && on_battery)
> References : http://lkml.org/lkml/2006/10/31/333
> Submitter  : Ernst Herzberg <earny@...4u.de>
> Status     : submitter was asked to bisect
> 
> It seems to be completely unrelated (except that it's also a ThinkPad), 
> but it might be worth a try whether a (non-SMP) kernel without APIC 
> support fixes the issues after resume.
> 
> Hugh, your laptop seems to be a non-SMP laptop.
> Do you have APIC enabled, and if yes does disabling help?
> 
> cu
> Adrian
> 
> 
> VERSION = 2
> PATCHLEVEL = 6
> SUBLEVEL = 19
> EXTRAVERSION = -rc4
> NAME=ThinkPad Killer
> 
> -
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