linux-kernel - Re: /sys/module/pcie_aspm/parameters/policy not writable?

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Date:	Wed, 31 Jul 2013 17:53:15 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Greg KH <greg@...ah.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	Joe Lawrence <joe.lawrence@...atus.com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Tushar Dave <tushar.n.dave@...el.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>
Subject: Re: /sys/module/pcie_aspm/parameters/policy not writable?

On Fri, Jul 19, 2013 at 11:46 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:

> Just to make sure I understand you correctly: I think you are saying
> that the NIC has the same problem under Windows.

Can you confirm or deny that the same problem occurs with Windows?

> But since the problem also occurs with Windows, it's pretty likely
> that there's a BIOS update to fix it.  I notice on the X60 support
> page that there are several versions newer than what you're running.

Do you have any interest in trying a newer BIOS to see if it's fixed
there?  If not, I understand; BIOS updates are a hassle at best.
You're running BIOS 2.14, and it looks like the current BIOS for an
X60 1709 7HU is 2.19 (from http://support.lenovo.com).

Carolyn's patch will likely work, at least most of the time, but I
think there's a small possibility that it could cause a conflict
between the BIOS and the OS over ASPM control, so I'm not 100% in
support of that approach.  A conflict may not happen on your machine,
and not on my machine, but it may happen somewhere, and if it does
happen, it's likely to be rare and difficult to debug.

Bjorn
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