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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1347539/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
