Hi Christopher, git bisect found the first good commit, here's the full output from the last command:
bd9b2f9aff26c185c1f8e0cd08a850ee4ace391a is the first bad commit commit bd9b2f9aff26c185c1f8e0cd08a850ee4ace391a Author: Rafael J. Wysocki <rafael.j.wyso...@intel.com> Date: Mon Jul 14 22:41:41 2014 +0200 ACPI / scan: No implicit wake notification for buttons The ACPI device enumeration code in Linux assumes that buttons always are wakeup devices, so it calls acpi_setup_gpe_for_wake() for them which leads to undesirable side effects. Namely, that function sets up implicit device wake notification mechanism for a given GPE if there is no handler method in the ACPI namespace, which from the ACPICA's perspective means that there always is a way to handle that GPE if enabled. However, we don't handle wake notify events for buttons, so if there are no handler methods for their GPEs in the namespace, enabling a button GPE at run time leads to a GPE storm in some cases (the GPE triggers, ACPICA carries out the implicit wake notification for it which isn't handled, so the GPE triggers again and so on). To prevent that from happening use acpi_mark_gpe_for_wake() instead of acpi_setup_gpe_for_wake() for buttons which will cause ACPICA to only enable button GPEs if there are handler methods for the in the namespace. Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com> :040000 040000 fec6e6222f6b0f58a5106035c38c7091a48eef0c f6c36ad741c62668891689c8229c3703146dc92e M drivers Let me know if there's anything else I need to do, Nikola -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1406767 Title: High ACPI event count on Asus K750L, causing ~12% non-stop CPU utilization Status in linux package in Ubuntu: Incomplete 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1406767/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp