Periodic machine lockups/hangs, every 10 seconds
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Invalid
|
Undecided
|
Unassigned |
Bug Description
Since updating to Ubuntu 10.10 (Maverick), my 5 y/o Sony VAIO Laptop experiences periodic short lockups (<1s) every 10 seconds.
During the lockup, everything stands still. No kind of output (mouse cursor movement, text output in console etc.) takes place, further evidenced by the fact that if sound is playing, the soundcard stutters on what seems to be the last sample in the buffer. Then everything resumes and works normally until the next lockup.
I wrote a small python script that constantly outputs the current system time to a file and Matlab to draw a plot of the reported time differences. The plot can be found attached to this bug or here: http://
(the python script that generates the data can be found at http://
Assuming that system time is unaffected by the problem, you can see that the time between soft lockups is about 10 seconds. Here are the exact differences:
10.5005 10.7519 10.5282 10.7829 10.5291 10.7840 10.4960 10.8160
10.4640 10.8840
Duration of a lockup seems to alternate between (very roughly) 0.25s and 0.5s:
0.2539 0.4277 0.3080 0.4437 0.2969 0.4394 0.2817 0.4602
0.2723 0.4935 0.2259
Please note that this is not an exact measurement, may contain sampling errors and that it works on the assumption that the system time as returned by the system call is unaffected. I just wanted a quick way to estimate intervals and duration of the lockups.
Let me know if I can provide anything else!
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-
Regression: Yes
Reproducible: Yes
ProcVersionSign
Uname: Linux 2.6.35-22-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/pcmC0D0p: ejelly 3139 F...m pulseaudio
/dev/snd/timer: ejelly 3139 f.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'I82801DBICH4'
Mixer name : 'Analog Devices AD1981B'
Components : 'AC97a:41445374'
Controls : 28
Simple ctrls : 20
Date: Sun Oct 10 17:15:39 2010
HibernationDevice: RESUME=
MachineType: Sony Corporation PCG-TR5MP(CH)
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcCmdLine: BOOT_IMAGE=
ProcEnviron:
LANGUAGE=en
PATH=(custom, user)
LANG=de_DE.UTF-8
SHELL=/bin/zsh
RelatedPackageV
SourcePackage: linux
dmi.bios.date: 11/28/2003
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: R0111G1
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.
dmi.modalias: dmi:bvnPhoenixT
dmi.product.name: PCG-TR5MP(CH)
dmi.product.
dmi.sys.vendor: Sony Corporation
summary: |
- Periodic machine lockups, every 10 seconds + Periodic machine lockups/hangs, every 10 seconds |
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
Same problem here with my Dell Studio Desktop.