Comment 0 for bug 1413149

I'm running 64 bit ubuntu 14.10 on an Asus N550JK-DB74T laptop. When I startup Ubuntu the system load climbs to 1.00 within a minute, and it never goes below 1.00 again, despite my processor being idle. This behavior occurs in all the newer kernels I installed from http://kernel.ubuntu.com/~kernel-ppa/mainline/ but when I installed the kernel from ubuntu 14.04, as well when I ran the ubuntu 14.04 from a usb the load average behaved normally, so the bug must have started in either kernel 3.15 or 3.16.

When I posted this to ubuntu forums, a very helpful person able to point me to this bug report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=765717 and to this submitted patch https://lkml.org/lkml/2014/11/5/905 . When I applied that patch to kernel 3.16 my issue was solved. However it doesn't seem that this patch has been has been merged into the kernel, even though it was submitted well in time for the 3.19 merge window. I was advised to file this bug report in the meantime.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: linux-image-3.16.0-29-generic 3.16.0-29.39
ProcVersionSignature: Ubuntu 3.16.0-29.39-generic 3.16.7-ckt2
Uname: Linux 3.16.0-29-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: dave 2338 F.... pulseaudio
 /dev/snd/controlC0: dave 2338 F.... pulseaudio
CurrentDesktop: Unity
Date: Wed Jan 21 05:14:38 2015
InstallationDate: Installed on 2014-12-30 (22 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
MachineType: ASUSTeK COMPUTER INC. N550JK
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-29-generic.efi.signed root=UUID=b5b33d3f-e01a-4d2b-824f-8883fbfed316 ro quiet splash acpi_osi= vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.16.0-29-generic N/A
 linux-backports-modules-3.16.0-29-generic N/A
 linux-firmware 1.138.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/26/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: N550JK.208
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: N550JK
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.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN550JK.208:bd09/26/2014:svnASUSTeKCOMPUTERINC.:pnN550JK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN550JK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: N550JK
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.