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I am running Ubuntu 10.04 LTS on a Dell PowerEdge T410 and using a wired network connection. Whenever system becomes idle, it looses network connection.

I needed to either logout or restart the machine in order to make network connections work. However, I have another Dell server running 10.04 LTS and it is working fine.

$ lspci 
... ...
01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5716 Gigabit Ethernet (rev 20)
01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5716 Gigabit Ethernet (rev 20)
... ...

$ uname -a
Linux ubuntu-user 2.6.32-34-server #77-Ubuntu SMP Tue Sep 13 20:54:38 UTC 2011 x86_64 GNU/Linux

 $ tail -300 /var/log/kern.log | grep "Nov  4"
Nov  4 12:36:34 ubuntu-user kernel: [161497.534069] npviewer.bin[17951]: segfault at eeb740a4 ip 00000000f5d74c83 sp 00000000ff8d4ed0 error 4 in[f58f7000+fc7000]

$ tail -10 /var/log/pm-powersave.log
/usr/lib/pm-utils/power.d/powersave-policy-hda-powerdown false:success.
/usr/lib/pm-utils/power.d/sched-powersave false:**sched policy powersave OFF
/usr/lib/pm-utils/power.d/95hdparm-apm true:success.
/usr/lib/pm-utils/power.d/anacron true:stop: Unknown instance: 
/usr/lib/pm-utils/power.d/powersave-policy-dirty-writeback true:success.
/usr/lib/pm-utils/power.d/powersave-policy-hda-powerdown true:success.
/usr/lib/pm-utils/power.d/sched-powersave true:**sched policy powersave ON

What is the problem and how can I solve it?

share|improve this question
I would check /var/log/kern.log for more information. Seems odd for an interface to drop off the face of the earth without a message in kern.log – Mordoc Nov 4 '11 at 22:08
Hi, Thank you for the suggestion. Please see the updated question. There is only one error message (for today). Do you think that is the reason? Please let me know. – samarasa Nov 4 '11 at 22:18
This question appears to be abandoned, if you are experiencing a similar issue please ask a new question with details pertaining to your problem. If you feel this question is not abandoned, please flag the question explaining that. :) – James Feb 3 '12 at 1:26
You know what, I have exactly the same issue on two different AMD machines. It would periodically loose networking and then come alive again after maybe a few minutes. – Matt H Feb 9 '12 at 21:11
up vote 1 down vote accepted

I'll assume that "system becomes idle" means "screensaver activated" or "lid closed", and suggest that the Power Manager is your culprit. Look at /var/log/pm-*.log and man pm-powersave

share|improve this answer
If I deactivate the screensave (i.e. blank screensaver), can I overcome the problem. – samarasa Nov 4 '11 at 23:25
That was a step I took, too. But then I learned about Power Manager, and now I've told Power Manager NOT to mess with my network. That's the knowledge that I hope I've encapsulated in my answer above. – waltinator Nov 5 '11 at 15:51
I have update my question with pm-powersave.log details. Please let me know if there something wrong. Thanks. – samarasa Nov 9 '11 at 21:59
I can't tell, from the log fragment you posted. DO NOT post your whole log. Run this command: grep -i -n -B2 fail /var/log/pm-powersave.log. You should be able to read the log file, and see that /usr/lib/pm-utils/power.d/powersave-policy-hda-powerdown false:success. means that it ran the program/script "powersave-policy-hda-powerdown false" and that the result was "success", for each line in the log file, especially the ones that don't have "success". Then read the failing script and decide if it is reasonable for your system. Read man pm-powersave. – waltinator Nov 13 '11 at 1:51

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