On my machine, Dell D830 4965, I have:

[    0.000000] Linux version 2.6.28-13-generic (bui...@yellow) (gcc version 
4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #45-Ubuntu SMP Tue Jun 30 22:12:12 UTC 2009 
(Ubuntu 2.6.28-13.45-generic)
[103180.006792] iwlagn: Detected Intel Wireless WiFi Link 4965AGN REV=0x4

and the driver version is:

[103180.006420] iwlagn: Intel(R) Wireless WiFi Link AGN driver for
Linux, 1.3.27ks

My Gentoo system on the same machine has:

[    0.000000] Linux version 2.6.29-gentoo-r5 (r...@deuterium) (gcc version 
4.1.2 (Gentoo 4.1.2 p1.1)) #4 SMP PREEMPT Mon Jun 1 17:35:18 PDT 2009
[   12.720433] iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, 
1.3.27kds

And a Fedora 11 system has:

Linux version 2.6.29.4-167.fc11.x86_64 
([email protected]) (gcc version 4.4.0 20090506 (Red 
Hat 4.4.0-4) (GCC) ) #1 SMP Wed May 27 17:27:08 EDT 2009
iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, 1.3.27kds

Wireless works as expected on Gentoo and Fedora, but fails miserably on
Ubuntu. To get a more stable connection I change the parameter in /sys
and keep a ping to my AP. Also, since I use NFS at the home network, I
noticed that it seems much more prone to problems when I copy large
files the easy way, i.e. through NFS/TCP. Since recently I started to
use rsync to transfer files from a wired machine and the problems are
now much less frequent.

Apart from the "kds" (Gentoo, Fedora) vs. "ks" (Ubuntu), the other
outstanding difference is the kernel version and patch sets. Gentoo and
Fedora are 29, but I previously had 28 on Gentoo and it worked as well.
So, I think it has to be  something in the Ubuntu kernel patch set... I
also recall the previous Ubuntu installation was 8.10, in which wireless
worked OK, and after upgrading to 9.04 the flakey behaviour showed back
(was originally present on 8.04). The current system is a fresh 9.04
installation though.

It is Ubuntu-related only.

-- 
[Jaunty] Intel wireless 3945ABG is unstable and disconnects frequently
https://bugs.launchpad.net/bugs/348204
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