[Intel-wired-lan] [Regression] "e1000e: Add support for S0ix" breaks s2idle on Lenovo X1 Carbon 7th

Vitaly Lifshits vitaly.lifshits at intel.com
Tue Mar 17 14:39:46 UTC 2020

On 3/17/2020 16:04, Kai-Heng Feng wrote:
>> On Mar 17, 2020, at 21:56, Neftin, Sasha <sasha.neftin at 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

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