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Message-ID: <16187.36046.209532.255482@gargle.gargle.HOWL>
Date: Thu, 14 Aug 2003 15:21:18 +0200
From: Mikael Pettersson <mikpe@csd.uu.se>
To: Ruben Puettmann <ruben@puettmann.net>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: 2.4.22 APM problems with IBM Thinkpad's
In-Reply-To: <20030814122845.GA2264@puettmann.net>
References: <20030813123119.GA25111@puettmann.net>
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Ruben Puettmann writes:
 > On Wed, Aug 13, 2003 at 03:11:27PM +0100, Alan Cox wrote:
 > > On Mer, 2003-08-13 at 14:13, Mikael Pettersson wrote:
 > > > With APIC support enabled (SMP or UP_APIC), APM must be constrained:
 > > > DISPLAY_BLANK off
 > > > CPU_IDLE off
 > > > built-in driver, not module
 > > 
 > > This isnt sufficient because some of the SMM traps off the FN-key 
 > > sequences also crash thinkpads if APIC is enabled. Basically *dont use
 > > local apic* except on SMP.
 > 
 > sorry but why breaks this all under linux? O.K im not a friend if
 > windows but on the preinstalled windowsXP it runs all fine.

Because Winblows typically won't attempt to use the local APIC
on uniprocessor machines.

 > Is this a problem of manpower or missing spec's? 

BIOS limitations or bugs (depending on your POV)

It tends to work on desktop machines but break on laptops.
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