Public bug reported: In the last several days, the Unity UI has started to always show that my laptop is running on battery, even when the AC adapter is connected. Annoyingly, this bad reading of state seems to extend to auto-suspend logic, so the laptop will auto-suspend when at low battery even after I've plugged in the AC adapter.
The hardware is clearly working - the battery charge level does increase when I plug in the adapter, and the built-in indicator (three flashes of the power indicator light when the adapter is connected) shows that at some low level the plug event is being detected. My assumption is that this is kernel-related, but I don't really know that for sure; attached is my APT log, showing my most recent few dist- upgrades. The one on 4/12 is for reference about past package versions only; the dist-upgrade on 4/16 is the last one before this issue popped up; and the one on 4/20 was my attempt to upgrade in the hopes that a fix had already been released. The only thing that catches my eye is the upgrade from kernel 3.16.0-34.45~14.04.1 to kernel 3.16.0-34.47~14.04.1, which seems to include several thinkpad_acpi changes. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.16.0-34-generic 3.16.0-34.47~14.04.1 ProcVersionSignature: Ubuntu 3.16.0-34.47~14.04.1-generic 3.16.7-ckt8 Uname: Linux 3.16.0-34-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.10 Architecture: amd64 CurrentDesktop: Unity Date: Mon Apr 20 10:14:31 2015 InstallationDate: Installed on 2013-06-28 (661 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) SourcePackage: linux-lts-utopic UpgradeStatus: Upgraded to trusty on 2014-04-25 (360 days ago) ** Affects: linux-lts-utopic (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug third-party-packages trusty ** Attachment added: "recent_apt_history.log" https://bugs.launchpad.net/bugs/1446312/+attachment/4380141/+files/recent_apt_history.log -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-lts-utopic in Ubuntu. https://bugs.launchpad.net/bugs/1446312 Title: On Thinkpad T431s, plugged-in AC adapter not detected Status in linux-lts-utopic package in Ubuntu: New Bug description: In the last several days, the Unity UI has started to always show that my laptop is running on battery, even when the AC adapter is connected. Annoyingly, this bad reading of state seems to extend to auto-suspend logic, so the laptop will auto-suspend when at low battery even after I've plugged in the AC adapter. The hardware is clearly working - the battery charge level does increase when I plug in the adapter, and the built-in indicator (three flashes of the power indicator light when the adapter is connected) shows that at some low level the plug event is being detected. My assumption is that this is kernel-related, but I don't really know that for sure; attached is my APT log, showing my most recent few dist-upgrades. The one on 4/12 is for reference about past package versions only; the dist-upgrade on 4/16 is the last one before this issue popped up; and the one on 4/20 was my attempt to upgrade in the hopes that a fix had already been released. The only thing that catches my eye is the upgrade from kernel 3.16.0-34.45~14.04.1 to kernel 3.16.0-34.47~14.04.1, which seems to include several thinkpad_acpi changes. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.16.0-34-generic 3.16.0-34.47~14.04.1 ProcVersionSignature: Ubuntu 3.16.0-34.47~14.04.1-generic 3.16.7-ckt8 Uname: Linux 3.16.0-34-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.10 Architecture: amd64 CurrentDesktop: Unity Date: Mon Apr 20 10:14:31 2015 InstallationDate: Installed on 2013-06-28 (661 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) SourcePackage: linux-lts-utopic UpgradeStatus: Upgraded to trusty on 2014-04-25 (360 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1446312/+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