[Bug 1347539] [NEW] Abnormally high battery discharge rate on Lenovo T420

[Luís de Sousa]

Public bug reported:

I have upgraded from12.04 to 14.04 on a Lenovo T420 laptop (Corei7-2620M
CPU @ 2.70GHz × 4 + Sandybridge Mobile). Whereas with 12.04 the battery
discharge rate would stay somewhere between 10 - 12 W/h, with 14.04 it
remains persistently over 30 W/h.

The discharge rate came closer to normal after an upgrade by late May.
But last week, apparently after an upgrade to linux-headers-generic, the
abnormally high discharge rate is back.

This thread at AskUbuntu details what I have tried (unsuccessfully) to
identify the cause of this problem:

http://askubuntu.com/questions/461620/ubuntu-14-04-draining-laptop-
battery-quicker-than-in-12-04-1-hour-versus-4-hou

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.2
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Jul 23 11:15:26 2014
InstallationDate: Installed on 2011-07-22 (1096 days ago)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to trusty on 2014-05-02 (81 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade trusty

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https://bugs.launchpad.net/bugs/1347539

Title:
  Abnormally high battery discharge rate on Lenovo T420

Status in “ubuntu-release-upgrader” package in Ubuntu:
  New

Bug description:
  I have upgraded from12.04 to 14.04 on a Lenovo T420 laptop
  (Corei7-2620M CPU @ 2.70GHz × 4 + Sandybridge Mobile). Whereas with
  12.04 the battery discharge rate would stay somewhere between 10 - 12
  W/h, with 14.04 it remains persistently over 30 W/h.

  The discharge rate came closer to normal after an upgrade by late May.
  But last week, apparently after an upgrade to linux-headers-generic,
  the abnormally high discharge rate is back.

  This thread at AskUbuntu details what I have tried (unsuccessfully) to
  identify the cause of this problem:

  http://askubuntu.com/questions/461620/ubuntu-14-04-draining-laptop-
  battery-quicker-than-in-12-04-1-hour-versus-4-hou

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.2
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Jul 23 11:15:26 2014
  InstallationDate: Installed on 2011-07-22 (1096 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to trusty on 2014-05-02 (81 days ago)
  VarLogDistupgradeTermlog:

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