X1 Carbon 6th gen S0i3 sleep broken

[blackomegax]

Recent kernel claims S0i3 patch, but this mode is not currently engage "out of the box" on latest patch levels of 18.04. Sleep consumes 2-3 watts instead of 0.1.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1756105

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.16 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc4

[jacco (jacco-2)]

have the same issue. tried latest mainline http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16-rc5/ but this does not fix the issue.

dmesg shows ACPI supports S0 S4 S5

/sys/power/mem_sleep shows only [s2idle]

quite a lot of people reporting same problem, see e.g. https://forums.lenovo.com/t5/Linux-Discussion/X1-Carbon-Gen-6-cannot-enter-deep-sleep-S3-state-aka-Suspend-to/m-p/3998182

[jacco (jacco-2)]

note that in previously mentioned thread on lenovo forum the workaround used is to enable S3 by patching DSDT tables. for those interested: see https://bbs.archlinux.org/viewtopic.php?id=234913

it seems to me the root cause is not so much S3 state support is missing, but that S0i3 isn't recognized/used by kernel.

[AaronMa (mapengyu)]

please pass `acpi.ec_no_wakeup=1` on the Linux command line to reduce the power consumption.

From v4.13 S0ix is supported by kernel.

CPU and PCH are not in deep idle status when kernel set S0ix mode.

The further solution should be fixed by BIOS/EC, ThinkPad BIOS/EC team already acked this issue.

[jacco (jacco-2)]

thanks! that helps indeed. it's not completely preventing wake-up events it seems, as usually after longer period it wakes up, but it definitely helps reduce power consumption. I'll experiment some more to see if/how I can influence the wake-up.

[jacco (jacco-2)]

fyi almost all of the time after suspending it will wake up at some point. but there is an small upside to that; closing/opening lid "works". battery drain is definitely lower during suspend compared to ec_no_wakeup=0

[BenKochie (ben-nerp)]

Not a fix for S0i3, but the latest X1 6th Gen BIOS (1.30) now has a power option to enable S3 without having to patch.