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Date: Tue, 27 Sep 2011 09:54:28 -0700
From: Yinghai Lu <yinghai.lu@oracle.com>
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To: Takashi Iwai <tiwai@suse.de>
CC: "Rafael J. Wysocki" <rjw@sisk.pl>, linux-kernel@vger.kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>, oneukum@suse.de, x86@kernel.org,
        Linux PM mailing list <linux-pm@lists.linux-foundation.org>,
        Ingo Molnar <mingo@redhat.com>
Subject: Re: S4 resume broken since 2.6.39 (3.1, too)
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On 09/27/2011 09:38 AM, Takashi Iwai wrote:
>>
>>> Any hint for further debugging?
>>
>>
>> you may try to insert dead loop in arch/x86/power/hibernate_asm_64.S::restore_image or core_restore_code
>>
>> to see which part cause reset.
>
> That's the answer I was afraid of :)
>

haha, because that time console port is away?

or if you have debug card with port 80 LED, you can add delay and output 
some code there.

BTW, can you post detail sequence and log ?
I could try if i can duplicate in my setups.

Thanks

Yinghai