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[imi415 <imi415.public@xxxxxxxxx>]

First I thank you all for reply. I tried to recompile the kernel but I
found out that this config has already been enabled. Then I found that
this problem is caused by the kernel is lack of AXP288 PMIC driver, not
the kernel itself.(ref:
https://bugzilla.kernel.org/show_bug.cgi?id=88471 ) Thank you again for
patience.

** Bug watch added: Linux Kernel Bug Tracker #88471
   http://bugzilla.kernel.org/show_bug.cgi?id=88471

** 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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