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Message #100190
[Bug 1347539] Re: Abnormally high battery discharge rate on Lenovo T420
A Windows user reports a discharge rate of 7-8 W/h running Word, with
WiFi and Bluetooth off:
http://forum.notebookreview.com/lenovo/574678-thinkpad-t420s-owners-
thread-10-print.html
With kernel 3.17 and no programmes running the discharge rate is about
the double of that.
Reagrds.
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https://bugs.launchpad.net/bugs/1347539
Title:
Abnormally high battery discharge rate on Lenovo T420
Status in linux package in Ubuntu:
Confirmed
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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