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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: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade trusty
-- 
Abnormally high battery discharge rate on Lenovo T420
https://bugs.launchpad.net/bugs/1347539
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