I have the same problem with a Logitech M337 mouse and the
4.15.0-22-lowlatency kernel on my Dell Inspiron 15 laptop.

I also with a different Logitech M337 on the 4.4.15.0-22-generic kernel
on an Asus Transformer T300 Chi. Its bluetooth docking station reports
zero battery, too.

All three bluetooth devices reported credible power levels under their
17.10 systems they were running before upgrading to bionic.

Is it a coincidence the two machines have Intel wifi/bluetooth adapters
which use iwlwifi-7265D-29.ucode?

I can run apport from these two machines if that would be helpful.

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https://bugs.launchpad.net/bugs/1769075

Title:
  [regression][bionic] Bluetooth keyboard battery reports 0% (in kernel
  4.15 and later)

Status in bluez package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I've recently upgraded to 18.04 from 17.10 and after the upgrade "upower -d"
  reports always 0% as battery percentage of the bluetooth Logitech K810 
keyboard.
  Which is a bit annoying since I get a KDE warning on the battery.

  Device: /org/freedesktop/UPower/devices/keyboard_hid_34o88o5do5eo0co2f_battery
    native-path:          hid-34:88:5d:5e:0c:2f-battery
    model:                Logitech K810
    power supply:         no
    updated:              Fri 04 May 2018 09:20:43 AM CEST (51 seconds ago)
    has history:          yes
    has statistics:       yes
    keyboard
      present:             yes
      rechargeable:        yes
      state:               unknown
      warning-level:       none
      percentage:          0%
      icon-name:          'battery-missing-symbolic'

  My guess is that the issue is in the bluetooth rather in the upowerd
  since the reporting in the /sys/devices shows battery level of 0
  --- 
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  bnv        1714 F.... pulseaudio
   /dev/snd/pcmC0D0p:   bnv        1714 F...m pulseaudio
   /dev/snd/controlC0:  bnv        1714 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=e962613c-fc88-4740-8f0a-997838d3c2cf
  InstallationDate: Installed on 2017-11-02 (185 days ago)
  InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 
(20171017.1)
  IwConfig:
   lo        no wireless extensions.
   
   enp0s25   no wireless extensions.
  MachineType: Dell Inc. Precision Tower 5810
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-20-generic 
root=UUID=4940c5fe-b600-4f27-8586-c6ac06ccea99 ro vga=773 quiet
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-20-generic N/A
   linux-backports-modules-4.15.0-20-generic  N/A
   linux-firmware                             1.173
  RfKill:
   0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
  Tags:  bionic
  Uname: Linux 4.15.0-20-generic x86_64
  UpgradeStatus: Upgraded to bionic on 2018-04-30 (7 days ago)
  UserGroups: adm cdrom dialout dip kvm lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/08/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A19
  dmi.board.name: 0K240Y
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 7
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA19:bd05/08/2017:svnDellInc.:pnPrecisionTower5810:pvr:rvnDellInc.:rn0K240Y:rvrA01:cvnDellInc.:ct7:cvr:
  dmi.product.name: Precision Tower 5810
  dmi.sys.vendor: Dell Inc.

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