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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Tags added: kernel-da-key

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https://bugs.launchpad.net/bugs/1406767

Title:
  [Asus X750LN] High ACPI event count causing ~12% non-stop CPU
  utilization

Status in linux package in Ubuntu:
  Triaged

Bug description:
  This started as soon as I installed Ubuntu when I bought my laptop,
  about 3 months ago. Due to other bugs with the kernel that Ubuntu
  uses, I switched to the latest mainline kernel available and that
  resolved the issue for me. At the time, this was
  3.16.3-031603.201409171435_amd64 . Ubuntu(14.10) itself is using
  3.16.0-28-generic at the moment.

  For only 16 minutes of uptime, cat /sys/firmware/acpi/interrupts/gpe_all yields this: 
  50867044

  Which is over 50 million interrupts. To illustrate the rate at which those events are fired, I ran this command: 
  cat /sys/firmware/acpi/interrupts/gpe_all && sleep 10 && cat /sys/firmware/acpi/interrupts/gpe_all  and the result was: 
  58397255
  58916975

  A little over half a million interrupts in 10 seconds.

  Again - this doesn't happen in the 3.17 kernel. At this point, I'm not
  sure whether this is a regression or if the fix hasn't gotten to
  Ubuntu yet.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-28-generic 3.16.0-28.38
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  Date: Wed Dec 31 15:48:51 2014
  HibernationDevice: RESUME=UUID=7b341f94-cd2e-461a-8b9b-38d1161c43a6
  InstallationDate: Installed on 2014-09-21 (101 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: ASUSTeK COMPUTER INC. X750LN
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic root=UUID=7f1fe8aa-bbe8-435d-979a-261f0331631e ro quiet splash i8042.noloop=1 psmouse.proto=bare acpi_osi= vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-28-generic N/A
   linux-backports-modules-3.16.0-28-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  StagingDrivers: keucr
  UpgradeStatus: Upgraded to utopic on 2014-11-05 (55 days ago)
  dmi.bios.date: 02/19/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 201
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X750LN
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  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.:bvr201:bd02/19/2014:svnASUSTeKCOMPUTERINC.:pnX750LN:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX750LN:rvr1.0:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: X750LN
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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