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Message #30189
[Bug 1223851] Re: High CPU load after resuming on Samsung NP550P5C in BIOS mode
The model code is NP550P5C-T01AR. It's an Argentinean model. The only
difference with the factory model is the harddrive (which I had to
replace because the original died a month after I bought it) and the
RAM, which I bumped to 16Gb.
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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, 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
WORKAROUND: It doesn't happen if I plug the same device on a USB2
port.
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.
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