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 ** Tags added: kernel-bug-exists-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1756105 Title: X1 Carbon 6th gen S0i3 sleep broken Status in linux package in Ubuntu: Confirmed Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1756105/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
