I have been trying various kernels to see if it would help. The battery
consumption got (almost) back to normal under 4.17.0~rc3 but now with
rc6 is down to 1:30h again.

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https://bugs.launchpad.net/bugs/1767324

Title:
  Extreme regression in battery autonomy with kernel 4.15

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Since upgrading to kernel 4.15, my laptop (HP Elitebook 850 G3) lasts
  less than one hour on a fully charged battery. On Ubuntu 17.10 with
  kernel 4.13, the autonomy was typically in excess of 5 hours.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-lowlatency 4.15.0.20.23
  ProcVersionSignature: Ubuntu 4.15.0-20.21-lowlatency 4.15.17
  Uname: Linux 4.15.0-20-lowlatency x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jzimm      3538 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Apr 27 20:10:02 2018
  InstallationDate: Installed on 2018-04-03 (24 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180402)
  MachineType: HP HP EliteBook 850 G3
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/bionic/vmlinuz-4.15.0-20-lowlatency 
root=UUID=b6480aee-7c63-4ce4-9e8d-cdbef768b982 ro 
rootflags=subvol=@,relatime,autodefrag,space_cache quiet splash 
module.sig_enforce=1 intel_pstate=skylake_hwp radeon.si_support=0 
radeon.cik_support=0 amdgpu.si_support=1 amdgpu.cik_support=1 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-20-lowlatency N/A
   linux-backports-modules-4.15.0-20-lowlatency  N/A
   linux-firmware                                1.173
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/31/2016
  dmi.bios.vendor: HP
  dmi.bios.version: N75 Ver. 01.10
  dmi.board.name: 8079
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 85.6F
  dmi.chassis.asset.tag: 5CG6351LQL
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.modalias: 
dmi:bvnHP:bvrN75Ver.01.10:bd07/31/2016:svnHP:pnHPEliteBook850G3:pvr:rvnHP:rn8079:rvrKBCVersion85.6F:cvnHP:ct10:cvr:
  dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=ELI
  dmi.product.name: HP EliteBook 850 G3
  dmi.sys.vendor: HP

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