I tried the latest kernel version (3.12.0-031200-generic) from Ubuntu's kernel PPA and the issue is no longer present.
-- 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/1223851 Title: High CPU load after resuming on Samsung NP550P5C in BIOS mode Status in The Linux Kernel: Unknown Status in “linux” package in Ubuntu: Incomplete Bug description: Description of problem: After I resume the system and plug something in one of the machine's USB3 ports (it doesn't happen if I plug the same device on a USB2 port), the CPU load raises to 50%, with one particular process with the highest load: 4 root 20 0 0 0 0 R 50.1 0.0 1:43.63 kworker/0:0 The problem seems to be caused by too many ACPI interrupts: root@ubuntu:~# grep -r . /sys/firmware/acpi/interrupts/ /sys/firmware/acpi/interrupts/sci:12554973 /sys/firmware/acpi/interrupts/error: 0 /sys/firmware/acpi/interrupts/gpe00: 0 invalid /sys/firmware/acpi/interrupts/gpe01: 0 invalid /sys/firmware/acpi/interrupts/gpe02: 0 enabled /sys/firmware/acpi/interrupts/gpe03: 0 disabled /sys/firmware/acpi/interrupts/gpe04: 0 disabled /sys/firmware/acpi/interrupts/gpe05: 0 disabled /sys/firmware/acpi/interrupts/gpe06: 0 enabled /sys/firmware/acpi/interrupts/gpe07: 0 invalid /sys/firmware/acpi/interrupts/gpe08: 0 invalid /sys/firmware/acpi/interrupts/gpe09: 0 disabled /sys/firmware/acpi/interrupts/gpe10: 0 invalid /sys/firmware/acpi/interrupts/gpe11: 0 invalid /sys/firmware/acpi/interrupts/gpe12: 0 invalid /sys/firmware/acpi/interrupts/gpe13: 0 invalid /sys/firmware/acpi/interrupts/gpe14: 0 invalid /sys/firmware/acpi/interrupts/gpe15: 0 invalid /sys/firmware/acpi/interrupts/gpe16: 0 invalid /sys/firmware/acpi/interrupts/gpe0A: 0 invalid /sys/firmware/acpi/interrupts/gpe17: 1504 enabled /sys/firmware/acpi/interrupts/gpe0B: 0 disabled /sys/firmware/acpi/interrupts/gpe18: 0 invalid /sys/firmware/acpi/interrupts/gpe0C: 0 disabled /sys/firmware/acpi/interrupts/gpe19: 0 invalid /sys/firmware/acpi/interrupts/gpe0D:12553562 enabled /sys/firmware/acpi/interrupts/gpe0E: 0 disabled /sys/firmware/acpi/interrupts/gpe20: 0 disabled /sys/firmware/acpi/interrupts/gpe0F: 0 invalid /sys/firmware/acpi/interrupts/gpe21: 0 invalid /sys/firmware/acpi/interrupts/gpe22: 0 invalid /sys/firmware/acpi/interrupts/gpe23: 0 invalid /sys/firmware/acpi/interrupts/gpe24: 0 invalid /sys/firmware/acpi/interrupts/gpe25: 0 disabled /sys/firmware/acpi/interrupts/gpe26: 0 invalid /sys/firmware/acpi/interrupts/gpe1A: 0 invalid /sys/firmware/acpi/interrupts/gpe27: 0 invalid /sys/firmware/acpi/interrupts/gpe1B: 0 invalid /sys/firmware/acpi/interrupts/gpe28: 0 invalid /sys/firmware/acpi/interrupts/gpe1C: 0 invalid /sys/firmware/acpi/interrupts/gpe29: 0 invalid /sys/firmware/acpi/interrupts/gpe1D: 0 invalid /sys/firmware/acpi/interrupts/gpe1E: 0 enabled /sys/firmware/acpi/interrupts/gpe30: 0 invalid /sys/firmware/acpi/interrupts/gpe1F: 0 enabled /sys/firmware/acpi/interrupts/gpe31: 0 invalid /sys/firmware/acpi/interrupts/gpe32: 0 invalid /sys/firmware/acpi/interrupts/gpe33: 0 invalid /sys/firmware/acpi/interrupts/gpe34: 0 invalid /sys/firmware/acpi/interrupts/gpe35: 0 invalid /sys/firmware/acpi/interrupts/gpe36: 0 invalid /sys/firmware/acpi/interrupts/gpe2A: 0 invalid /sys/firmware/acpi/interrupts/gpe37: 0 invalid /sys/firmware/acpi/interrupts/gpe2B: 0 invalid /sys/firmware/acpi/interrupts/gpe38: 0 invalid /sys/firmware/acpi/interrupts/gpe2C: 0 invalid /sys/firmware/acpi/interrupts/gpe39: 0 invalid /sys/firmware/acpi/interrupts/gpe2D: 0 invalid /sys/firmware/acpi/interrupts/gpe2E: 0 invalid /sys/firmware/acpi/interrupts/gpe2F: 0 invalid /sys/firmware/acpi/interrupts/gpe3A: 0 invalid /sys/firmware/acpi/interrupts/gpe3B: 0 invalid /sys/firmware/acpi/interrupts/gpe3C: 0 invalid /sys/firmware/acpi/interrupts/gpe3D: 0 invalid /sys/firmware/acpi/interrupts/gpe3E: 0 invalid /sys/firmware/acpi/interrupts/gpe3F: 0 invalid /sys/firmware/acpi/interrupts/sci_not: 0 /sys/firmware/acpi/interrupts/ff_pmtimer: 0 invalid /sys/firmware/acpi/interrupts/ff_rt_clk: 0 disabled /sys/firmware/acpi/interrupts/gpe_all:12556159 /sys/firmware/acpi/interrupts/ff_gbl_lock: 0 disabled /sys/firmware/acpi/interrupts/ff_pwr_btn: 0 enabled /sys/firmware/acpi/interrupts/ff_slp_btn: 0 invalid I can mitigate the problem by disabling that particular source # echo disable > /sys/firmware/acpi/interrupts/gpe0D This also happens on Fedora 19 but doesn't happen on Ubuntu 13.04, so it seems the bug was introduced after the 3.8 kernel. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: linux-image-3.11.0-5-generic 3.11.0-5.11 ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0 Uname: Linux 3.11.0-5-generic x86_64 ApportVersion: 2.12.1-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ubuntu 4220 F.... pulseaudio CasperVersion: 1.336 Date: Wed Sep 11 12:31:17 2013 LiveMediaBuild: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130910) MachineType: SAMSUNG ELECTRONICS CO., LTD. 550P5C/550P7C MarkForUpload: True ProcEnviron: LANGUAGE=en_US TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: initrd=/casper/initrd.lz file=/cdrom/preseed/hostname.seed boot=casper quiet splash -- persistent BOOT_IMAGE=/casper/vmlinuz.efi PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.11.0-5-generic N/A linux-backports-modules-3.11.0-5-generic N/A linux-firmware 1.113 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/18/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P08AAA.045.130418.dg dmi.board.asset.tag: No Asset Tag dmi.board.name: SAMSUNG_NP1234567890 dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.board.version: SEC_SW_REVISION_1234567890ABCD dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 9 dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD. dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP08AAA.045.130418.dg:bd04/18/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn550P5C/550P7C:pvrP08AAA:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A: dmi.product.name: 550P5C/550P7C dmi.product.version: P08AAA dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1223851/+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
