netdev - Re: IAMT broken by commit 82776a4bcd7aa5fbcd2e6339b3ce88b727dd40ab

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Message-ID: <20110131114558.GA28303@volta.aurel32.net>
Date:	Mon, 31 Jan 2011 12:45:58 +0100
From:	Aurelien Jarno <aurelien@...el32.net>
To:	"Allan, Bruce W" <bruce.w.allan@...el.com>
Cc:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: IAMT broken by commit 82776a4bcd7aa5fbcd2e6339b3ce88b727dd40ab

Hi,

On Tue, Jun 01, 2010 at 04:33:27PM -0700, Allan, Bruce W wrote:
> I will look into this in the next couple days.
> 
> -----Original Message-----
> From: Aurelien Jarno [mailto:aurelien@...el32.net] 
> Sent: Saturday, May 29, 2010 6:02 PM
> To: Allan, Bruce W; Kirsher, Jeffrey T
> Cc: netdev@...r.kernel.org
> Subject: IAMT broken by commit 82776a4bcd7aa5fbcd2e6339b3ce88b727dd40ab
> 
> Hi,
> 
> I have recently upgrade my kernel, and found that Intel AMT support is
> not working anymore as expected. I have configured IAMT so that is 
> always available, even when the machine is off ("Desktop: ON in S0, S3,
> S4-5").
> 
> On recent kernels, IAMT support does not work after the machine has 
> been powered-off. Even worse, it also goes into this state when I try
> to reboot it.
> 
> I have done a bisect and got this commit:
> 
> | commit 82776a4bcd7aa5fbcd2e6339b3ce88b727dd40ab
> | Author: Bruce Allan <bruce.w.allan@...el.com>
> | Date:   Fri Aug 14 14:35:33 2009 +0000
> | 
> |     e1000e: WoL does not work on 82577/82578 with manageability enabled
> |     
> |     With manageability (Intel AMT) enabled via BIOS, PHY wakeup does not get
> |     configured on newer parts which use PHY wakeup vs. MAC wakeup which causes
> |     WoL to not work.  The driver should configure PHY wakeup whether or not
> |     manageability is enabled.
> |     
> |     Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
> |     Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> |     Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> I have tried to revert it on recent kernels (2.6.34), and IAMT is then
> working as expected. My machine is using a Gigabyte EQ45M-S2 motherboard
> with an 82567LM-3 ethernet chip (8086:10de), that is a different model
> than the one of the original problem.
> 
> I do wonder if the changes in the patch should not only be done on some 
> chip models, and I will appreciate any help in fixing this issue.
> 

Just a short mail to say this problem is still present in 2.6.38-rc2.
The same solution still applies, that is reverting the above commit.
Note that reverting the first hunk only is enough to get it working
again.

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien@...el32.net                 http://www.aurel32.net
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