Public bug reported:

my laptop's battery time decreased since I've installed 16.04. When I
used 14.04 it worked about 4h, now it's max 2h (still 4 on Win 10). I
tried powertop and tlp but it didn't help. My laptop is Dell 3543 with
Nvidia GF820 and i5 5200.

It also suffers from heavy disk i/o, even while idle.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.14
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
NonfreeKernelModules: wl nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Tue May 10 20:22:51 2016
InstallationDate: Installed on 2016-04-27 (13 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade xenial

** Package changed: ubuntu-release-upgrader (Ubuntu) => ubuntu

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https://bugs.launchpad.net/bugs/1580289

Title:
  Battery time decreased after fresh install of 16.04

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