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
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https://bugs.launchpad.net/bugs/1446312
Title:
On Thinkpad T431s, plugged-in AC adapter not detected
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