From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vitaly Lifshits <vitaly.lifshits@intel.com>
Date: Tue, 17 Mar 2020 16:39:46 +0200
Subject: [Intel-wired-lan] [Regression] "e1000e: Add support for S0ix"
 breaks s2idle on Lenovo X1 Carbon 7th
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 <8c0032bd-15be-734b-1b52-dedba72a8da3@intel.com>
 <897C8B9E-839A-4FC1-9411-B3CB141890BC@canonical.com>
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To: intel-wired-lan@osuosl.org
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On 3/17/2020 16:04, Kai-Heng Feng wrote:
> 
> 
>> On Mar 17, 2020, at 21:56, Neftin, Sasha <sasha.neftin@intel.com> wrote:
>>
>> On 3/17/2020 15:34, Kai-Heng Feng wrote:
>>> Hi,
>>> Users reported that X1 Carbon 7th can only suspend once due of "e1000e 0000:00:1f.6 enp0s31f6: Hardware Error" [1] [2].
>>> I managed to get one at hand and I can confirm the issue is 100% reproducible.
>>> The error occurs at the first e1e_rphy() in e1000_copper_link_setup_82577() [3].
>>> Reverting "e1000e: Add support for S0ix" makes suspend work again.
>>> I also tried commit e1738282f6c6 "e1000e: fix S0ix flows for cable connected case" however the issue persists.
>>> Kai-Heng
>>> [1] https://bugs.launchpad.net/bugs/1865570
>>> [2] https://bugs.launchpad.net/bugs/1866170
>>> [3] https://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue.git/tree/drivers/net/ethernet/intel/e1000e/phy.c?h=dev-queue&id=e1738282f6c6ad0ec56a15c4d5a3b657d90e4435#n630
>> please, check of ME enabled on this system. try disable ME and re-run
> 
> I disabled "Intel AMT", issue is still reproducible.
> 
> Kai-Heng
> 
Hi Kai,

Do you work with cable connected?
If so, please try to run this command:
sudo echo 3 > /sys/kernel/debug/pmc_core/ltr_ignore