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Message #09834
[Bug 998204] Re: Intel chipset driver bug on Ubuntu certified Dell Latitude E5420: connecting power cord makes kworker run amok
I got tired of this buggy laptop so I gave it away and bought a new Dell
XPS 13 with preinstalled Ubuntu. It sometimes also freezes, but I don't
have time to debug everything. I really hope that in the future all pre-
installed Ubuntu machines I buy would work perfectly. Thanks for your
efforts towards that!
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https://bugs.launchpad.net/bugs/998204
Title:
Intel chipset driver bug on Ubuntu certified Dell Latitude E5420:
connecting power cord makes kworker run amok
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
I've noticed that sometimes when I'm running on battery and then
insert the power cord, the system slows down significantly. When I
remove the power cord, it runs fine again, and when I reattach the
power cord the system slows down again.
I'm running the latest Ubuntu 12.04 with all updates on a pre-
installed Dell Latitude E5420 that is supposed to work perfectly with
Ubuntu, since it is officially certified.
While the sluggishness happens, running 'top' shows several kworker processes:
top - 21:29:24 up 14:01, 4 users, load average: 1.91, 2.16, 2.06
Tasks: 208 total, 3 running, 202 sleeping, 0 stopped, 3 zombie
Cpu(s): 5.6%us, 2.2%sy, 0.0%ni, 91.7%id, 0.5%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1891244k total, 1782568k used, 108676k free, 22512k buffers
Swap: 2004988k total, 812400k used, 1192588k free, 550600k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
16561 otto 20 0 526m 15m 7796 S 14 0.9 1:10.79 gnome-system-mo
16534 root 20 0 0 0 0 R 7 0.0 0:16.66 kworker/1:2
1215 root 20 0 275m 25m 4472 S 6 1.4 11:31.39 Xorg
16362 root 20 0 0 0 0 S 3 0.0 0:10.00 kworker/0:1
1889 otto 20 0 1470m 64m 12m S 3 3.5 10:07.92 compiz
16287 root 20 0 0 0 0 S 3 0.0 0:13.85 kworker/3:2
2306 otto 20 0 652m 14m 5056 S 2 0.8 0:31.76 gnome-terminal
17304 otto 20 0 17480 1384 964 R 1 0.1 0:00.03 top
Using commands
sudo perf record -ag sleep 30
sudo perf report
I was able to find out that the kworker threads running amok are due to the Intel I2C driver:
...
2.91% kworker/1:2 [kernel.kallsyms] [k] na
|
--- native_read_tsc
|
|--62.97%-- delay_tsc
| |
| |--53.92%-- __udelay
| | |
| | |--50.48%-- sclhi
| | | |
| | | |--94.88%-- i2c_outb
...
2.76% kworker/1:0 [kernel.kallsyms] [k] na
|
--- native_read_tsc
|
|--69.42%-- delay_tsc
| |
| |--58.89%-- __udelay
| | |
| | |--47.38%-- sclhi
| | | |
| | | |--88.80%-- i2c_outb
...
2.20% kworker/0:0 [kernel.kallsyms] [k] na
|
--- native_read_tsc
|
|--64.58%-- delay_tsc
| |
| |--63.38%-- __udelay
| | |
| | |--47.18%-- i2c_outb.isra.4
| | | try_address
| | | bit_doAddress.isra.7
| | | bit_xfer
| | | intel_i2c_quirk_xfer
...
I've attached the entire perf report output for your analysis.
To view the stack of the process I ran cat /proc/16287/stack >
pid-16287-stack.txt, which is also attached.
Please fix the Intel driver so that it does not spawn any wild kworker processes and publish the fix in the 12.04 mainline kernel. I've noticed that others have this sympoms too, but I guess few are knowledgeable enough to file a proper bug report, so I decided to do one. For example, see comment #27 at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/887793/comments/27 or http://askubuntu.com/questions/106187/lenovo-thinkpad-l520-slows-down-when-ac-power-adapter-is-plugged-in
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-24-generic 3.2.0-24.37
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: otto 1897 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0x93d40000 irq 44'
Mixer name : 'Intel CougarPoint HDMI'
Components : 'HDA:111d76e7,1028049b,00100102 HDA:80862805,80860101,00100000'
Controls : 37
Simple ctrls : 13
CheckboxSubmission: d8cea1222d756fdd8d727e88eb0e4a11
CheckboxSystem: d00f84de8a555815fa1c4660280da308
Date: Fri May 11 22:05:56 2012
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=affcc5fa-3b4d-40de-aec2-259585dbd9e3
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
MachineType: Dell Inc. Latitude E5420
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic root=UUID=0fc070a9-5f2c-41fc-b8f0-6e0a91fa1426 ro quiet i915.semaphores=1 pcie_aspm=force
PulseList:
Error: command ['pacmd', 'list'] failed with exit code 1: Home directory /home/otto not ours.
No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-3.2.0-24-generic N/A
linux-backports-modules-3.2.0-24-generic N/A
linux-firmware 1.79
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: Upgraded to precise on 2012-04-09 (31 days ago)
dmi.bios.date: 02/22/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A00
dmi.board.name: 08N8FC
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA00:bd02/22/2011:svnDellInc.:pnLatitudeE5420:pvr01:rvnDellInc.:rn08N8FC:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E5420
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
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