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[Bug 1446312] Re: On Thinkpad T431s, plugged-in AC adapter not detected


On further testing, this looks like a hardware failure; the timing with
the kernel upgrade is probably coincidence. Booting to an older kernel
does not fix the problem, and charge detection works as expected when
using the dock connector.

(Turns out the laptop was also not *charging* when plugged in and
powered on, but would charge when plugged in and powered off. Weird, but
probably not software's fault?)

** Changed in: linux-lts-utopic (Ubuntu)
       Status: New => Invalid

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  On Thinkpad T431s, plugged-in AC adapter not detected

Status in linux-lts-utopic package in Ubuntu:

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)

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