Does this issue go away if you boot into a previous kernel?  If not,
this is probably a BIOS bug, which would need to be addressed by the
hardware manufacturer.

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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

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  BIOS update 219 (from 215) for Asus UX31A led to battery % error

Status in “linux” package in Ubuntu:

Bug description:
  Following a BIOS update from 215 to 219 for my Asus UX31A, battery %
  now reports as being on 84% when it should read 100% (as it does in
  Windows 8). This value will remain permanently on 84% and will never
  reach 100% when plugged into the mains. The little light on the power
  cable lights up as green colour suggesting battery is at fully
  charged, thus confirming there is some kind of miscommunication
  between my hardware and xubuntu/kernel. This could be an Asus BIOS
  fault rather than a bug. Either way, I'd appreciate a fix.

  Prior to this BIOS update, my battery reached 100%.

  I'm using XUBUNTU 13.04 (upgraded from 12.10)

  (An additional issue is that the fan also seems a little more active
  than it was before the update, but this may perhaps need to be put
  into a seperate bug report.)

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-29-generic 3.8.0-29.42
  ProcVersionSignature: Ubuntu 3.8.0-29.42-generic
  Uname: Linux 3.8.0-29-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
   /dev/snd/controlC0:  christopher   2349 F.... volumeicon
  Date: Thu Aug 22 20:58:31 2013
  HibernationDevice: RESUME=UUID=4a9691f1-20d6-4e42-bffd-d4dbe3ed18cf
  InstallationDate: Installed on 2012-12-12 (252 days ago)
  InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Release amd64 
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-29-generic 
root=UUID=b25cb360-b179-400a-a007-244ec031fe0b ro quiet splash add_efi_memmap 
i915.i915_enable_rc6=1 pcie_aspm=force drm.vblankoffdelay=1 i915.semaphores=1 
nmi_watchdog=0 vt.handoff=7
   linux-restricted-modules-3.8.0-29-generic N/A
   linux-backports-modules-3.8.0-29-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: Upgraded to raring on 2013-04-26 (118 days ago) 06/14/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX31A.219
  dmi.board.asset.tag: ATN12345678901234567 UX31A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
dmi:bvnAmericanMegatrendsInc.:bvrUX31A.219:bd06/14/2013:svnASUSTeKCOMPUTERINC.:pnUX31A:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX31A:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: UX31A
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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