Looking to comment #20 it looks like a kernel issue, the /sys entry tell the charge level is 100%
Is /sys/class/power_supply/BAT0/status also telling you 'charging' when it's on battery? Googling a bit I found https://bbs.archlinux.org/viewtopic.php?id=238944 which states it started being buggy on the 4.17 kernel, which would explain why it works on the 'old 4.15' kernel you have with mint. The comment also state that it's fixed in kernel 4.20.13, could you try on a 19.04 liveCD to see if the new kernel there makes it work for you? ** Bug watch added: Linux Kernel Bug Tracker #201351 https://bugzilla.kernel.org/show_bug.cgi?id=201351 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/1824886 Title: Battery level stuck at 100% and Estimating... Status in gnome-power-manager package in Ubuntu: Incomplete Bug description: Battery applet does not display battery charge. Always shows 100%. ASUS 1215T-RED008S. Description: Ubuntu 18.04.2 LTS Release: 18.04 gnome-control-center: Установлен: 1:3.28.2-0ubuntu0.18.04.2 Кандидат: 1:3.28.2-0ubuntu0.18.04.3 ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-control-center 1:3.28.2-0ubuntu0.18.04.2 ProcVersionSignature: Ubuntu 4.18.0-17.18~18.04.1-generic 4.18.20 Uname: Linux 4.18.0-17-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.9-0ubuntu7.6 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Tue Apr 16 00:48:18 2019 InstallationDate: Installed on 2019-04-10 (5 days ago) InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210) ProcEnviron: PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=ru_RU.UTF-8 SHELL=/bin/bash SourcePackage: gnome-control-center UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/1824886/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
