Abnormally high battery discharge rate on Lenovo T420
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Medium
|
Unassigned |
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-
This thread at AskUbuntu details what I have tried (unsuccessfully) to identify the cause of this problem:
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-
ProcVersionSign
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)
PackageArchitec
SourcePackage: ubuntu-
Symptom: release-upgrade
UpgradeStatus: Upgraded to trusty on 2014-05-02 (81 days ago)
VarLogDistupgra
affects: | ubuntu-release-upgrader (Ubuntu) → linux (Ubuntu) |
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