linux-kernel - Re: FADT errors reported by Lenovo T61

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Date:	Mon, 18 Nov 2013 10:42:07 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Zdenek Kabelac <zkabelac@...hat.com>
Cc:	robert.moore@...el.com, rafael.j.wysocki@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: FADT errors reported by Lenovo T61

On Mon, 2013-11-18 at 10:22 +0100, Zdenek Kabelac wrote:
> I've noticed strange errors in the log - while my wifi seems to work ok,
> the surrounding errors do not seem normal.
> 
> Is there anything I could do to fix them ?
> Or it will remain broken or there could workaround ?
> 
> I'm attaching my boot log - with:
> 
> "ACPI BIOS Warning (bug): 32/64X length mismatch in FADT/Gpe1Block: 0/32 
> (20130725/tbfadt-572)"
> 
> which probably leads to -
> 
> "ACPI FADT declares the system doesn't support PCIe ASPM, so disable it"
> 
> and
> 
> "acpi PNP0A08:00: Disabling ASPM (FADT indicates it is unsupported)"
> 
> and at the end after my networking is started I get this:
> 
> iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux, 
> in-tree:ds
> iwl3945: Copyright(c) 2003-2011 Intel Corporation
> iwl3945 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control

The ASPM stuff need not be related to that "ACPI BIOS Warning (bug)"
line you saw.

I noticed similar ASPM messages on a ThinkPad X220 (I'm not sure whether
they are new, as I only recently acquired that X220):
    $ sudo grep -e ASPM -e FADT $(ls -1tr /var/log/messages*)
    [...]
    [...] kernel: [    0.080253] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it
    [...] kernel: [    0.126158] acpi PNP0A08:00: ACPI _OSC control for PCIe not granted, disabling ASPM
    [...] kernel: [    4.448730] iwlwifi 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control

I remember looking at the code that generates these messages and
thinking they were confusing. It seems "disabling ASPM" means something
subtly different than "disable ASPM". But I can't remember exactly.
Anyhow, I haven't yet tried suggesting alternatives for these messages.
Perhaps I'll do that one of these days.


Paul Bolle

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