kernel-packages team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.17 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.17-rc1-utopic/

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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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:
  Incomplete

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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