Comment 33 for bug 216634

I am seeing this bug and has been fighting it ever since upgrading to Jaunty. I am now running latest Karmic alpha release with newest updates and the problem persists.

It seems that the problem is most pronounced during high load on the network (i.e. during downloading or flash video streaming), however, I suspect that this is simply because it is more noticeable during high load! As far as I can tell, the connection cuts out with exactly 30 minute intervals. About 30 seconds after, this message shows up in the syslog:

Oct 15 00:09:01 localhost CRON[3987]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -n 200 -r -0 rm)

Besides that, my syslog is being spammed with:

Oct 15 00:16:07 localhost kernel: [ 5487.712146] Inbound IN=wlan0 OUT= MAC= SRC=192.168.1.4 DST=192.168.1.255 LEN=242 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=138 DPT=138 LEN=222

with random intervals, and:

Oct 15 00:15:22 localhost wpa_supplicant[1314]: CTRL-EVENT-SCAN-RESULTS

with exactly 120 seconds interval. I don't really think the later two have anything to do with the bug, but I'm pretty much a novice, so I included them, just for good measure.

Most of the time, the connection is reestablished by itself, but sometimes I have to force it by removing the iwlagn module and reloading it.

I have tried several different things:

- Tried alternatives to Network Manager, none of them helped
- Tried switching my router to WEP encryption, nothing changed
- Tried ndiswrapper, didn't work at all
- Tried installing Jaunty (and later Karmic) backports which made Ubuntu crash during boot
- Switched to a brand new router, same problem

Only remedy is to use a wired connection.

When running Vista, the connection works without a glitch, another computer in my network running Hardy has been running rock steady for over a year now with nothing resembling this. This computer worked fine up until shortly after installing Jaunty (upgraded directly from Hardy to Jaunty).

The system is a Acer Aspire 5920G, 2,0 GHz T7300 with the Intel 4965AGN adapter.