Battery status unknown on Lenovo X1 Carbon Extreme Gen 2

[Lee Trager]

I have a Lenovo X1 Carbon Extreme Gen 2. When I first installed Focal on it battery status was working however its now stuck at 59% even though its been charging for days.

$ cat /sys/class/power_supply/BAT0/status
Unknown
$ cat /sys/class/power_supply/BAT0/capacity
59
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu15
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: lee 4054 F.... pulseaudio
 /dev/snd/controlC1: lee 4054 F.... pulseaudio
 /dev/snd/controlC0: lee 4054 F.... pulseaudio
 /dev/snd/pcmC0D0p: lee 4054 F...m pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2019-12-29 (31 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20191220)
MachineType: LENOVO 20QVCTO1WW
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
Package: linux (not installed)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-12-generic root=/dev/mapper/samsung--ssd-ROOT ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-12-generic N/A
 linux-backports-modules-5.4.0-12-generic N/A
 linux-firmware 1.185
Tags: focal
Uname: Linux 5.4.0-12-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip libvirt lpadmin lxd plugdev sambashare sudo wireshark
_MarkForUpload: True
dmi.bios.date: 11/25/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N2OET41W (1.28 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20QVCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0R32862 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN2OET41W(1.28):bd11/25/2019:svnLENOVO:pn20QVCTO1WW:pvrThinkPadX1Extreme2nd:rvnLENOVO:rn20QVCTO1WW:rvrSDK0R32862WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Extreme 2nd
dmi.product.name: 20QVCTO1WW
dmi.product.sku: LENOVO_MT_20QV_BU_Think_FM_ThinkPad X1 Extreme 2nd
dmi.product.version: ThinkPad X1 Extreme 2nd
dmi.sys.vendor: LENOVO

[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 1861330

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.

[Lee Trager (ltrager)]

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[Lee Trager (ltrager)]

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[Kai-Heng Feng (kaihengfeng)]

Is it a regression? Did it work on previous Ubuntu release?

[Lee Trager (ltrager)]

I've only ever run Focal on this laptop. When I first installed(end of December 2019) the battery level worked. I was using it while plugged in for a few weeks and recently noticed that the battery level stopped working.

According to [1] this laptop is certified pre-install for Ubuntu.

[1] https://certification.ubuntu.com/hardware/201906-27150

[Kai-Heng Feng (kaihengfeng)]

Can you please boot to and older kernel and see if it works?

[Francis Ginther (fginther)]

@ltrager,

Is this still an issue on recent kernels? The latest kernel, 5.4.0-20.24, is in https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/proposed if you can try it.

Otherwise, are you able to attempt installing older kernels to identify the last one which worked?

[Lee Trager (ltrager)]

I tested booting into Bionic which showed the battery level working. When I booted back into Focal the battery level was working again. I'm not sure why that fixed it but it did.

Thanks for looking into this!