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[imi415 <imi415.public@xxxxxxxxx>]

This issue was here since a clean install. I've tested with latest
4.7.0rc2 kernel and the issue exists. Battery info is not available. The
first comment contains the solution from ArchWiki, which needs to build
my own kernel. I haven't test it myself on the tablet, though. The bios
config has nothing associated with battery, acpi or i2c, so I didn't try
to modify it.

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

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https://bugs.launchpad.net/bugs/1589383

Title:
  Kernel With no I2C Controller Battery Support

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  For Bay-Trail tablets, the battery controller is using I2C bus , which needs the kernel to be compiled with symble ACPI_I2C_OPREGION [=y] (ref: https://bugs.archlinux.org/task/44582). Otherwise the battery status & information is unavailable. Ubuntu 16.04lts x86_64, Kernel version:4.4.0-22-generic
  --- 
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=ca8f4562-8c1d-42f0-8ce0-b6887e0a8800
  InstallationDate: Installed on 2016-05-30 (6 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed root=UUID=2aa6be00-076a-4e2d-8ea7-1cc505c7925a ro quiet splash intel_idle.max_cstate=1 vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  xenial
  Uname: Linux 4.4.0-22-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/19/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 5.6.5
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: tPAD
  dmi.board.vendor: TECLAST
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr5.6.5:bd12/19/2014:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnTECLAST:rntPAD:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.

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