[martin@mh57.de: Re: [ltp] Re: R40 APM Standby and Power-Off not working]

Mon, 16 Jun 2003 10:24:37 +0200

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I should have set the right sender address :-/

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Date: Sat, 14 Jun 2003 20:57:32 +0200
From: Martin Hermanowski <martin@mh57.de>
To: linux-thinkpad@linux-thinkpad.org
Subject: Re: [ltp] Re: R40 APM Standby and Power-Off not working
Message-ID: <20030614185732.GB25570@mh57.de>
References: <200306062153.58209.g_sauthoff@web.de> <200306071423.20080.g_sauthoff@web.de> <20030607123149.GD8449@mh57.de> <200306071733.28136.g_sauthoff@web.de> <20030607154845.GB20301@mh57.de> <871xxypspl.fsf@complete.org>
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On Thu, Jun 12, 2003 at 10:22:14PM -0500, John Goerzen wrote:
> Martin Hermanowski <martin@mh57.de> writes:
>=20
> >> > Are you sure that apm in enabled?
> >>=20
> >> Yes, of course, I posted the apm options, which are enabled, in my fir=
st mail.
> >
> > Try setting `Use real mode APM BIOS call to power off' to no. This
> > should not be needed on current machines.
>=20
> For what it's worth, I've observed the same behavior on my T40p and
> that option is indeed disabled over here.

I just read the attached mail on linux-kernel, perhaps this is an issue
specific to centrino-machines.

LLAP, Martin

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	 Sat, 14 Jun 2003 18:25:45 +0100
From: Edward Macfarlane Smith <snowfire@blueyonder.co.uk>
To: linux-kernel@vger.kernel.org
Subject: Machine does not shutdown with certain configuration
Date: Sat, 14 Jun 2003 18:26:21 +0100
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Since getting my new laptop (Sony PCG-Z1SP, it's a Centrino machine) I had 
never got it to successfully power off. I had just been using the SuSE kernel 
and then the same configuration that worked well on a couple of other 
machines, but I then tried a different configuration and it powered off, 
after I did a little playing I tracked it down to the "Local APIC support on 
uniprocessors" option. Turning this off makes the machine poweroff. 
I have checked this on 2.4.21-rc6-ac1 and 2.4.21-ac1. I just thought other 
people might find that useful to know. 
The text on the help for CONFIG_X86_UP_APIC seems to suggest it's fine to use 
it on any machine (and certainly while running it seems to make no 
difference), would a patch to the text to indicate it may prevent power off 
be accepted, or is this problem too specific to this machine to be included?
Regards,
Edward

e.g.

--- linux-2.4.21_ac1_orig/Documentation/Configure.help  2003-06-14 
16:00:30.000000000 +0100
+++ linux/Documentation/Configure.help  2003-06-14 18:04:18.000000000 +0100
@@ -289,6 +289,8 @@
   have a local APIC, then the kernel will still run with no slowdown at
   all. The local APIC supports CPU-generated self-interrupts (timer,
   performance counters), and the NMI watchdog which detects hard lockups.
+  On some machines (e.g. Sony Vaio PCG-Z1SP) this option may prevent the
+  machine from powering off when it is halted.

   If you have a system with several CPUs, you do not need to say Y
   here: the local APIC will be used automatically.

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