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

Kai-Heng Feng kai.heng.feng at canonical.com
Wed Mar 18 03:12:20 UTC 2020

Hi Vitaly,

> On Mar 17, 2020, at 22:39, Vitaly Lifshits <vitaly.lifshits at intel.com> wrote:
> 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?

No, ethernet cable is not plugged.

> If so, please try to run this command:
> sudo echo 3 > /sys/kernel/debug/pmc_core/ltr_ignore

Same issue after doing that.

Though unlikely, can this be caused by the special design of X1 Carbon?
To keep the laptop thin, it doesn't have a RJ45 port. Instead it has a special connecter which requires a RJ45 dongle to support ethernet.
Maybe that's why the PHY part isn't working after suspend?


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