Public bug reported:

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

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

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

Title:
  Kernel With no I2C Controller Battery Support

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