[Bug 665269] [NEW] system hangs very randomly, possibly due to dvb hardware

[karlrt]

Public bug reported:

on this pc, i want to use it as a mediacenter, the system freezes or
hangs randomly.

Observations:
- system freezes definitively, does never wake up from freeze
- when occurring during media playback, audio hangs in a 500ms loop, video always freezes
- system does not respond to ssh, ping or vnc during freeze
- system does not respond to kernel shortcuts ( e.g. alt+print+reisub )

So the only thing i can do yet is to hard reset the pc, i have not found
a way to get more info for this bug. I just know it happens on mythbuntu
10.04 and 10.10.

I have tried to test the hardware, started with harddisks (both smart and new partitioning) - nothing
I ran the system for two days without much hardware  (only one harddisk, no pci-dvb-s card, no usb dvb-t) and could not reproduce, so i thought it must be a hardware problem with one of them. But it happens with either one of them installed.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.35
Regression: No
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  karlrt     3113 F.... mythfrontend.re
 /dev/snd/pcmC0D0p:   karlrt     3113 F...m mythfrontend.re
 /dev/snd/timer:      karlrt     3113 f.... mythfrontend.re
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xfdff4000 irq 16'
   Mixer name	: 'Realtek ALC888'
   Components	: 'HDA:10ec0888,14627326,00100001'
   Controls      : 33
   Simple ctrls  : 19
Card1.Amixer.info:
 Card hw:1 'CX8811'/'Conexant CX8811 at 0xf8000000'
   Mixer name	: 'CX88'
   Components	: ''
   Controls      : 3
   Simple ctrls  : 2
Date: Fri Oct 22 20:13:11 2010
Frequency: Once a day.
HibernationDevice: RESUME=UUID=15ebc269-4bec-4774-a06e-331452e387ff
InstallationMedia: Mythbuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
MachineType: Acer M5610/M3610
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-22-generic root=UUID=239f8688-4062-4678-86c1-c4b601789be8 ro quiet splash
ProcEnviron:
 LANG=de_DE.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
RfKill:
 
SourcePackage: linux
dmi.bios.date: 11/01/2007
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: R01-B0
dmi.board.name: MRS600M
dmi.board.vendor: Acer
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrR01-B0:bd11/01/2007:svnAcer:pnM5610/M3610:pvrR01-B0:rvnAcer:rnMRS600M:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: M5610/M3610
dmi.product.version: R01-B0
dmi.sys.vendor: Acer

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug kernel-uncat maverick needs-upstream-testing

-- 
system hangs very randomly, possibly due to dvb hardware
https://bugs.launchpad.net/bugs/665269
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