[Bug 1792672] Re: Regression: acpi reports battery state incorrectly after sleep

** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete

** Tags added: needs-upstream-testing

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https://bugs.launchpad.net/bugs/1792672

Title:
Regression: acpi reports battery state incorrectly after sleep

Status in linux package in Ubuntu:
Incomplete

Bug description:
On Samsung Series 9 laptops the battery state and the charger status
are incorrectly reported in kernel 4.15.

This bug is a regression: it has been fixed in 2012 [1] it used to
work fine until Linux 14.10 (included).

Quoting Matthew McCallum from
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/971061/comments/161

> If I disconnect power, remove the back cover, disconnect both the main battery and the backup battery, I am able to get power status updates (e.g. battery will show as charging/charged when plugged in, or just regular battery when not). Once I sleep, I have to repeat this process if I want the battery status to work again.
>
> `acpi -p` correctly shows the charging state, but `tlp-stat -b` does not.

[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/971061/comments/159
---
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: gioele 1939 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=UUID=7e63a512-9a2c-4503-9bd9-ec2f74a7f029
InstallationDate: Installed on 2017-06-24 (447 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 900X3C/900X3D/900X3E/900X4C/900X4D
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-33-generic root=UUID=696c5d50-d388-4d33-b14a-babf7a7359df ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.15.0-33.36~16.04.1-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-33-generic N/A
linux-backports-modules-4.15.0-33-generic N/A
linux-firmware 1.157.20
Tags: xenial
Uname: Linux 4.15.0-33-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 04/09/2013
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P07ABK
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: NP900X3D-A03IT
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP07ABK:bd04/09/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn900X3C/900X3D/900X3E/900X4C/900X4D:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP900X3D-A03IT:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.family: ChiefRiver System
dmi.product.name: 900X3C/900X3D/900X3E/900X4C/900X4D
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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