[karmic] Wireless LAN disconnects frequently # Chipset Intel 3945ABG @ AP with WPA

[Ungolianth]

Error occurs at Karmic Koala Alpha5:

Everything's working fine, when using the WEP-Encryption.

But when using a WPA-Encryption, the device looses connection after about 10-15 seconds. In that short time I'm able to use the Internet...

--------------------------------------------------------
$ lspci |grep -i net
02:08.0 Ethernet controller: Intel Corporation 82562ET/EZ/GT/GZ - PRO/100 VE (LOM) Ethernet Controller Mobile (rev 01)
10:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
---------------------------------------------------------

If more data is needed contact me.

[arky (arky)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This bug did not have a package associated with it, which is important for ensuring that it gets looked at by the proper developers. You can learn more about finding the right package at https://wiki.ubuntu.com/Bugs/FindRightPackage. I have classified this bug as a bug in linux.

When reporting bugs in the future please use apport, either via the appropriate application's "Help -> Report a Problem" menu or using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

[Linus Harling (linus-ussarna)]

Same issue here, connecting with my laptop resets the AP, a D-Link Airplus G 2.4GHz wgl-g700ap thereby disconnecting all other devices.

My NIC is a:
01:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)

The other computer (running Jaunty) has a:
03:00.0 Network controller: Intel Corporation PRO/Wireless 4965AG or AGN [Kedron] Network Connection (rev 61)

We tried installing Karmic on the second computer a while ago, but switched back to Jaunty when the network issue occured. My laptop (the one with Karmic) works as expected with WPA2 at home, but not here.

I have a tcpdump -vvv -i wlan0 -w to send to anyone interested. Anything else that would be useful?

dmesg:
...
[55389.049332] wlan0: authenticate with AP 00:19:5b:04:c7:cf
[55389.052026] wlan0: authenticated
[55389.052034] wlan0: associate with AP 00:19:5b:04:c7:cf
[55389.054257] wlan0: RX AssocResp from 00:19:5b:04:c7:cf (capab=0x411 status=12 aid=2)
[55389.054265] wlan0: AP denied association (code=12)
[55389.252120] wlan0: associate with AP 00:19:5b:04:c7:cf
[55389.254446] wlan0: RX AssocResp from 00:19:5b:04:c7:cf (capab=0x411 status=12 aid=2)
[55389.254455] wlan0: AP denied association (code=12)
[55389.456057] wlan0: associate with AP 00:19:5b:04:c7:cf
[55389.458294] wlan0: RX AssocResp from 00:19:5b:04:c7:cf (capab=0x411 status=12 aid=2)
[55389.458303] wlan0: AP denied association (code=12)
[55389.656131] wlan0: association with AP 00:19:5b:04:c7:cf timed out
[55396.665209] wlan0: authenticate with AP 00:19:5b:04:c7:cf
[55396.668432] wlan0: authenticated
[55396.668440] wlan0: associate with AP 00:19:5b:04:c7:cf
[55396.671826] wlan0: RX AssocResp from 00:19:5b:04:c7:cf (capab=0x411 status=12 aid=1)
[55396.671834] wlan0: AP denied association (code=12)
[55396.868134] wlan0: associate with AP 00:19:5b:04:c7:cf
[55396.870436] wlan0: RX AssocResp from 00:19:5b:04:c7:cf (capab=0x411 status=12 aid=1)
[55396.870444] wlan0: AP denied association (code=12)
[55397.068091] wlan0: associate with AP 00:19:5b:04:c7:cf
[55397.070414] wlan0: RX AssocResp from 00:19:5b:04:c7:cf (capab=0x411 status=12 aid=1)
[55397.070422] wlan0: AP denied association (code=12)
[55397.268082] wlan0: association with AP 00:19:5b:04:c7:cf timed out
[55402.084845] wlan0: authenticate with AP 00:19:5b:04:c7:cf
[55402.088613] wlan0: authenticated
[55402.088621] wlan0: associate with AP 00:19:5b:04:c7:cf
[55402.092001] wlan0: RX AssocResp from 00:19:5b:04:c7:cf (capab=0x411 status=12 aid=1)
[55402.092033] wlan0: AP denied association (code=12)
[55402.288127] wlan0: associate with AP 00:19:5b:04:c7:cf
[55402.290464] wlan0: RX AssocResp from 00:19:5b:04:c7:cf (capab=0x411 status=12 aid=1)
[55402.290472] wlan0: AP denied association (code=12)
[55402.488172] wlan0: associate with AP 00:19:5b:04:c7:cf
[55402.490425] wlan0: RX AssocResp from 00:19:5b:04:c7:cf (capab=0x411 status=12 aid=1)
[55402.490434] wlan0: AP denied association (code=12)
[55402.688115] wlan0: association with AP 00:19:5b:04:c7:cf timed out
...

[Linus Harling (linus-ussarna)]

Anything more on this? I haven't visited the affected site for a while so I don't know if the issue remains.

Also, could this bug be moved/duped to Karmic's bug database?

[Ungolianth (morgenroot)]

Sorry, i can't tell. After a lot of other bugs and trouble i installed 9.04 again.

[Ungolianth (morgenroot)]

Bug still present in the Released version (29.10.09).

[Mackenzie Morgan (maco.m)]

15 seconds, you say? Two minutes so far pinging Google.com with no issue. It's a
Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
Subsystem: 8086:1000

What's the 2nd line of output in "lspci -nv | grep -A1 10:00.0" for you?

[Christian Reis (kiko)]

I am having the same problem on a Lenovo X61 with an Intel 4965AG 8086:4230 (rev 61) running iwlagn. It is perfectly reproducible; the error messages are exactly what Linus gets -- AP denied association (code=12).

[Mackenzie Morgan (maco.m)]

4965 as well? I've got one of those machines too. It's also fine. That one has
Subsystem: 8086:1100

[Ungolianth (morgenroot)]

Subsystem: 103c:135c

Notebook is the "HP 530"

[Linus Harling (linus-ussarna)]

Mackenzie Morgan skrev 2009-10-30 23:43:
> 4965 as well? I've got one of those machines too. It's also fine. That one has
> Subsystem: 8086:1100
>
As I said earlier; I suspect it has something to do with the AP/Router,
mine is fine as well, at home.

Ungoliath, what kind of router do you have?

/Linus

[Alexander Nevskiy (kepkin)]

I have absolutely the same issue.
Fujitsu Siemens Amilo Si1520

It used to work fine with my router before on 9.04. My router is Trendnet tew-432brp

[Alexander Nevskiy (kepkin)]

Subsystem: 8086:1001

[Miguel (miguel-glug)]

I have the same issue. My laptop, one Dell Latitude D630 with an Intel 4965 AGN wifi card, works flawlessly in Ubuntu 9.04 out of the box, but with 9.10 the wifi link is reloaded every two minutes, connecting and disconnecting from the network at random.

[Ungolianth (morgenroot)]

>> Ungolianth, what kind of router do you have?

AP is a "Level One WAP 0006"

[ken (f-canonici-gmail)]

I have the same issue. My laptop, Toshiba A500-14F with Intel Corporation Wireless WiFi Link 5100 works perfectly in ubuntu 9.04.
AP is a dlink DWL-G700AP works properly with any pc and wireless devices...the problem seems to be ubuntu 9.10, the wifi link is reloaded every two minutes, connecting and disconnecting from the network at random (copy & paste from Miguel post...i have the same issue)...i must use the wired connection.

Ken

[Jeff (rosejn)]

I've got the same issue with an Karmic upgrade from Jaunty on my Dell Latitude D630 laptop. In Jaunty wireless worked fine, and in Karmic it fails after 30 secs to a minute or two. Here's my 802.11 info:

Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)

and the output from dmesg:

[ 7935.095440] wlan0: AP denied association (code=12)
[ 7935.293078] wlan0: associate with AP 00:0e:2e:fe:c1:67
[ 7935.295359] wlan0: RX AssocResp from 00:0e:2e:fe:c1:67 (capab=0x411 status=12 aid=2)
[ 7935.295367] wlan0: AP denied association (code=12)
[ 7935.496049] wlan0: associate with AP 00:0e:2e:fe:c1:67
[ 7935.498307] wlan0: RX AssocResp from 00:0e:2e:fe:c1:67 (capab=0x411 status=12 aid=2)
[ 7935.498309] wlan0: AP denied association (code=12)
[ 7935.692140] wlan0: association with AP 00:0e:2e:fe:c1:67 timed out
[ 7942.379000] wlan0: authenticate with AP 00:0e:2e:fe:c1:67
[ 7942.380773] wlan0: authenticated
[ 7942.380775] wlan0: associate with AP 00:0e:2e:fe:c1:67
[ 7942.383103] wlan0: RX AssocResp from 00:0e:2e:fe:c1:67 (capab=0x411 status=12 aid=3)
[ 7942.383109] wlan0: AP denied association (code=12)
[ 7942.584067] wlan0: associate with AP 00:0e:2e:fe:c1:67
[ 7942.586415] wlan0: RX AssocResp from 00:0e:2e:fe:c1:67 (capab=0x411 status=12 aid=3)
[ 7942.586422] wlan0: AP denied association (code=12)
[ 7942.780105] wlan0: associate with AP 00:0e:2e:fe:c1:67
[ 7942.782514] wlan0: RX AssocResp from 00:0e:2e:fe:c1:67 (capab=0x411 status=12 aid=3)
[ 7942.782523] wlan0: AP denied association (code=12)
[ 7942.980183] wlan0: association with AP 00:0e:2e:fe:c1:67 timed out

[ken (f-canonici-gmail)]

I installed wicd from the repository, network manager will be removed automatically...now all works properly.

I hope this help.
Bye
Ken

[Miguel (miguel-glug)]

Yes, I can confirmed it. This issue concerns mainly to network-manager and network-manager-gnome. For some reason they disconnect the wireless link almost every minute. Installing wicd overcome this annoyance, but I hope these bugs can be solved soon in network-manager.

[Miguel (miguel-glug)]

May this bug be attached to the network-manager package?

[crazyserver (crazyserver)]

It could be a duplicate bug of:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/401272
or
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/348204

[Christian Reis (kiko)]

Ken, Miguel, Crazyserver, Ungolianth: can you check your dmesg output to see if you get the same messages that Linus, Jeff and I are getting? In particular:

  wlan0: AP denied association (code=12)

[Alexander Nevskiy (kepkin)]

Christian, I have it in demsg.

[vadchen (roizman)]

Hi,

I have similar problem, here is syslog:

Nov 10 15:25:00 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
Nov 10 15:25:01 localhost kernel: [119084.113318] wlan0: authenticate with AP 00:0e:2e:61:c3:24
Nov 10 15:25:01 localhost kernel: [119084.115173] wlan0: authenticated
Nov 10 15:25:01 localhost kernel: [119084.115181] wlan0: associate with AP 00:0e:2e:61:c3:24
Nov 10 15:25:01 localhost kernel: [119084.117344] wlan0: RX AssocResp from 00:0e:2e:61:c3:24 (capab=0x411 status=12 aid=1)
Nov 10 15:25:01 localhost kernel: [119084.117352] wlan0: AP denied association (code=12)
Nov 10 15:25:01 localhost kernel: [119084.312332] wlan0: associate with AP 00:0e:2e:61:c3:24
Nov 10 15:25:01 localhost kernel: [119084.323206] wlan0: RX AssocResp from 00:0e:2e:61:c3:24 (capab=0x411 status=12 aid=1)
Nov 10 15:25:01 localhost kernel: [119084.323215] wlan0: AP denied association (code=12)
Nov 10 15:25:01 localhost kernel: [119084.512068] wlan0: associate with AP 00:0e:2e:61:c3:24
Nov 10 15:25:01 localhost kernel: [119084.514445] wlan0: RX AssocResp from 00:0e:2e:61:c3:24 (capab=0x411 status=12 aid=1)
Nov 10 15:25:01 localhost kernel: [119084.514454] wlan0: AP denied association (code=12)
Nov 10 15:25:02 localhost kernel: [119084.712311] wlan0: association with AP 00:0e:2e:61:c3:24 timed out

[crazyserver (crazyserver)]

Yes, this is my error...

[praks (prakashpms)]

I am also experiencing the frequent wireless disconnection problem after upgrading to 9.10.

It is not only WPA encryption. It occurs even in WEP encryption or wireless networks without security. I use Acer Aspire 5580 model and it has the same intel wireless card.

$ lspci | grep -i net
02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8038 PCI-E Fast Ethernet Controller (rev 14)
03:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)

[leeon (leeon)]

I have same problem. If i start to use browser or else internet aplication, disconnecting my computer. Lots of time i cant reconnencting, and i need restart my computer, because the net just after work again. I did try to use wired or wireless card the problen is same.

I use Emachines e625. Amd chipsets Ubuntu 9.10 /64

[Simon Philipp (wulfconan)]

Same issue here.

0b:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection (rev 61)

[81103.190484] wlan0: authenticate with AP 00:21:29:c6:7d:12
[81103.193473] wlan0: authenticated
[81103.193477] wlan0: associate with AP 00:21:29:c6:7d:12
[81103.196599] wlan0: RX AssocResp from 00:21:29:c6:7d:12 (capab=0x411 status=12 aid=0)
[81103.196604] wlan0: AP denied association (code=12)
[81103.392746] wlan0: associate with AP 00:21:29:c6:7d:12
[81103.402210] wlan0: RX AssocResp from 00:21:29:c6:7d:12 (capab=0x411 status=12 aid=0)
[81103.402216] wlan0: AP denied association (code=12)
[81103.590163] wlan0: associate with AP 00:21:29:c6:7d:12
[81103.592737] wlan0: RX AssocResp from 00:21:29:c6:7d:12 (capab=0x411 status=12 aid=0)
[81103.592746] wlan0: AP denied association (code=12)
[81103.790105] wlan0: association with AP 00:21:29:c6:7d:12 timed out

Repeats over and over every so often, leaving me disconnected for about 10-20 seconds.

[KOPRajs (zdenek-koprivik)]

+1

The same problem here:
wlan0: AP denied association (code=12)

AP resets its wlan interface (but uptime on AP does not reset) so every other client connected to it gets disconnected too (repeats about every 2 minutes).

HW specs:
Intel WLAN 5100 card
Airlive 5460AP and 5470AP

Disabling network-manager and connecting manually with wpa_suplicant works.

[Christian Reis (kiko)]

Seem to be related:
  http://www.linuxquestions.org/questions/linux-wireless-networking-41/iwl4965-connection-problem-680917/

In order to get this moving this bug needs to be reported upstream to http://bugzilla.intellinuxwireless.org/

[Alexander Nevskiy (kepkin)]

Christian,

I'm quite sure, that this bug is connected to network-manager, not iwl. If I install wicd, WPA connection works flawlessly. Ken and Miguel also reported that (check comments above). Should we copy this bug for Gnome community then?

[Bremner (paullinden)]

Quoting Christian Reis <email address hidden>:OK I will have a look at
yours,in the
meantime I have reverted to 9.04 which works OK. I am not happy with karmic at
the moment and remain to be convinced that it is a stable system.

> Seem to be related:
>
> http://www.linuxquestions.org/questions/linux-wireless-networking-41/iwl4965-connection-problem-680917/
>
> In order to get this moving this bug needs to be reported upstream to
> http://bugzilla.intellinuxwireless.org/
>
> --
> [karmic] Wireless LAN disconnects frequently # Chipset Intel 3945ABG
> @ AP with WPA
> https://bugs.launchpad.net/bugs/425455
> You received this bug notification because you are subscribed to
> NetworkManager.
>
> Status in NetworkManager: New
> Status in ?linux? package in Ubuntu: Confirmed
>
> Bug description:
> Error occurs at Karmic Koala Alpha5:
>
> Everything's working fine, when using the WEP-Encryption.
>
> But when using a WPA-Encryption, the device looses connection after
> about 10-15 seconds. In that short time I'm able to use the
> Internet...
>
> --------------------------------------------------------
> $ lspci |grep -i net
> 02:08.0 Ethernet controller: Intel Corporation 82562ET/EZ/GT/GZ -
> PRO/100 VE (LOM) Ethernet Controller Mobile (rev 01)
> 10:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG
> [Golan] Network Connection (rev 02)
> ---------------------------------------------------------
>
> If more data is needed contact me.
>
>
>

[pwdove (pwdove)]

I am having the same issue as leeon. My wireless will work anywhere from 30 minutes to two hours before disconnecting. The only way for me to get wireless back is to reboot. Restarting the network with /etc/init.d/networking restart doesn't help. I am using wicd and NOT network-manager. Wicd fails at the obtaining IP address stage. I have WEP enabled. This worked flawlessly in Jaunty (9.04) and I have had problems ever since upgrading to Karmic (9.10)

0c:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)

0c:00.0 0280: 8086:4222 (rev 02)
 Subsystem: 8086:1020

[koshari (holto2go)]

same prob here,

[ 1220.727669] wlan0: AP denied association (code=12)
[ 1220.920129] wlan0: associate with AP 00:08:a1:a4:8b:82
[ 1220.922359] wlan0: RX AssocResp from 00:08:a1:a4:8b:82 (capab=0x411 status=12 aid=1)
[ 1220.922366] wlan0: AP denied association (code=12)
[ 1221.120113] wlan0: associate with AP 00:08:a1:a4:8b:82
[ 1221.122303] wlan0: RX AssocResp from 00:08:a1:a4:8b:82 (capab=0x411 status=12 aid=1)

over and over again, about every 30 secs,

ubuntu 9.10 64bit / Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)

works fine in windows vista and ubuntu 9.04.

[Rein (ub-ryysak)]

Same there with LENOVO ThinkPad X61s.
00:19.0 Ethernet controller: Intel Corporation 82566MM Gigabit Network Connection (rev 03)
03:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
With network manager connection is dropped and re-established with some minutes interval.
After changing to wicd everything works perfectly. Switching back to network manager - disconnecting again.

[koshari (holto2go)]

[ 532.832617] wlan0: direct probe to AP 00:08:a1:a4:8b:82 (try 1)
[ 532.835262] wlan0: direct probe responded
[ 532.835269] wlan0: authenticate with AP 00:08:a1:a4:8b:82 (try 1)
[ 532.837075] wlan0: authenticated
[ 532.837112] wlan0: associate with AP 00:08:a1:a4:8b:82 (try 1)
[ 532.839389] wlan0: RX ReassocResp from 00:08:a1:a4:8b:82 (capab=0x411 status=12 aid=1)
[ 532.839396] wlan0: AP denied association (code=12)
[ 532.839423] wlan0: associate with AP 00:08:a1:a4:8b:82 (try 1)
[ 532.841162] wlan0: RX ReassocResp from 00:08:a1:a4:8b:82 (capab=0x411 status=12 aid=1)
[ 532.841168] wlan0: AP denied association (code=12)
[ 532.841187] wlan0: deauthenticating from 00:08:a1:a4:8b:82 by local choice (reason=3)
ubuntu@ubuntu:~$ uname -a
Linux ubuntu 2.6.32-7-generic #10-Ubuntu SMP Sun Dec 6 13:54:12 UTC 2009 x86_64 GNU/Linux

[koshari (holto2go)]

update ,

connection appears to be stable when using wpa2 aes.
flakey when using wpa2 tkip settings in the access point.

so would appear corrent work around for me would be to select aes in access point.

[hauke24 (hauke-coltzau)]

Hi there,

I can confirm that workaround. WPA2 AES works fine.
TKIP does not, allthough it did before with Hardy Heron.

[Daniele (daniele-levorato)]

I can't use that workaround: my router doesn't support AES... what can I do? I would be glad if the problem was solved since I cannot find any other solution a part from re-installing 9.04 !!! For me it's a major issue since that PC must be connected 24x7

[Alexander Nevskiy (kepkin)]

Daniele

Just install Wicd - it work fine.
aptitude install wicd

[Tony Espy (awe)]

wicd in no way solves problems with problematic drivers...

[Alexander Nevskiy (kepkin)]

Tony

It's not a driver problematic. It's a Network Manager that doesn't work. I have this intel wifi card and Network Manager on 9.10 doesn't work with WPA Wifi (though it used to work on previous versions of Ubuntu). And I forced to use Wicd, because once I replaced Network Manager with Wicd I have not issues with Wifi at all.

[Daniele (daniele-levorato)]

I've read many other comments, about the fact that Wicd didn't solved the problem... However I'll give it a try and report back...

[David Malizia (david-malizia)]

I had the same problem on a Toshiba A300. No problem with 8.10, virtually no wireless with 9.10
looking at /var/log/daemon.log I realized that NetworkManager was logging the disconnection immediately after an error by wpa_supplicant.
In the same log on 8.10 there was no sign of wpa_supplicant (which I don't even think I had installed). Apparently they do not behave well together and they both get installed by default. The problem must also be related to the network card because on a second toshiba laptop I had no trouble at all.
I first thought about removing wpa_supplicant but this will remove also NetworkManager so I did the opposite and removed only NetworkManager. I configured the wpa_supplicant (there are various guides on how-to around the net) and the wirelss started working fine. I lost the nm-applet but I found a nice application which will do something similar called wpa_gui. It does only configure wireless connections but this is fine for me.

[flair310 (harshi-joy)]

I have the same problem on my Dell XPS 1530 with Intel 3945 LAN.

This seems to be a problem with latest kernels and i hope it gets fixed soon.

I have tried fresh installs from Ubuntu 9.10, Mandriva 2010, openSuse 11.2, Fedora 12. All of the distributions have it in their fresh installs.

I only recently decided to do a fresh install, before that i had Ubuntu 8.10 upgraded to 9.04 and to 9.10. I have never noticed this problem before. It started appearing in the fresh install of 9.10.

[Eric Swanson (eswanson)]

I'm also having this problem with Ubuntu 10.04 beta at my university running PEAP with MSCHAP. Wicd insists that I have the wrong username or password (which I know to be false -- they work in NM, albeit for a very short time).

[Eric Swanson (eswanson)]

(Sorry to double post !)
I configured wpa_supplicant with the relevant configuration information. Here are the final few lines from my run.

Trying to associate with 00:1a:1e:2b:9e:42 (SSID='Securewireless' freq=2437 MHz)
Authentication with 00:1a:1e:2b:9e:42 timed out.
Trying to associate with 00:1a:1e:2b:c3:62 (SSID='Securewireless' freq=2437 MHz)
Authentication with 00:1a:1e:2b:c3:62 timed out.
Trying to associate with 00:1a:1e:2b:cb:90 (SSID='Securewireless' freq=5240 MHz)
Associated with 00:1a:1e:2b:cb:90
WPA: Failed to get master session key from EAPOL state machines
WPA: Key handshake aborted
CTRL-EVENT-EAP-STARTED EAP authentication started
CTRL-EVENT-EAP-METHOD EAP vendor 0 method 25 (PEAP) selected
OpenSSL: tls_connection_handshake - Failed to read possible Application Data error:00000000:lib(0):func(0):reason(0)
EAP-MSCHAPV2: Authentication succeeded
EAP-TLV: TLV Result - Success - EAP-TLV/Phase2 Completed
( ... 15-20 seconds pass ... )
CTRL-EVENT-EAP-SUCCESS EAP authentication completed successfully
l2_packet_receive - recvfrom: Network is down
CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys

[szonek (pawel-acn)]

Same problem here on Ubuntu 10.04 RC (and 9.10) with Intel 3945ABG/BG wireless card:

[ 13.240637] iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux, 1.2.26ks
[ 13.296985] iwl3945 0000:05:00.0: Detected Intel Wireless WiFi Link 3945ABG

Installing WICD is an ugly workaround.

[szonek (pawel-acn)]

output of lspci -nv fore wireless:

05:00.0 0280: 8086:4222 (rev 02)
        Subsystem: 103c:135b
        Flags: bus master, fast devsel, latency 0, IRQ 28
        Memory at d4000000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: <access denied>
        Kernel driver in use: iwl3945
        Kernel modules: iwl3945

[gorkma (gorkmave128)]

I have the same problem with lucid and Intel PRO/Wireless 3945ABG, installing wicd it connects, but that is an ugly solution, Network-manager should work well too.

[VidJa (vidja-hunter)]

I have exactly the same problem that started with 9.10 but also with release lucid and Intel PRO/Wireless 3945ABG. After immediate connection upon installing I though the problems was solved, but the connection was dropped after about 30 minutes only to come back after a cold reboot.

[cne007 (cne007)]

same proble here, get disconnected too often.
running 2.6.32-22-generic, kubuntu 10.04 LTS.
run on a T60 (Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02))

Had Debian on it before, just install Kubuntu to check it out, but will soon be back to the root (debian) it nothing is fixed. Never had this problem before.

It's BAD!

[Angel Abad (angelabad)]

In Gnome Bugzilla Dan Williams said:

Can you grab the output of 'dmesg'? There should be a number of items related
to 'iwl3945' or 'iwlagn' in there that could help. Also, some additional
debugging tips are here:

http://live.gnome.org/NetworkManager/Debugging

in the "Debugging WiFi Connections" section; the supplicant log can be very
useful in determining the problem. The log bits linked in that Launchpad bug
aren't quite enough to determine the issue.

Thanks!

[szonek (pawel-acn)]

In attachment there is a log from wpa_supplicant in debug mode (ran with "-dddt").

[Soník (sonik-mh)]

Same here with ubuntu 10.04 Lucid Lynx

Iwifi connection (with WPA personal encryption) is established correctly (using NetworkManager), but after a 30s or so the connection is lost and it's connecting again, connected, but then lost again and again.

wifi card is Intel Pro Wireless 3945ABG

here is a part print of dmesg:

[ 24.324076] cfg80211: Found new beacon on frequency: 2472 MHz (Ch 13) on phy0
[ 25.068287] lp: driver loaded but no devices found
[ 25.123909] ppdev: user-space parallel port driver
[ 82.934132] wlan0: deauthenticating from 00:c0:ca:1d:1b:d5 by local choice (reason=3)
[ 82.936540] wlan0: direct probe to AP 00:c0:ca:1d:1b:d5 (try 1)
[ 82.953468] wlan0: direct probe responded
[ 82.953479] wlan0: authenticate with AP 00:c0:ca:1d:1b:d5 (try 1)
[ 82.961821] wlan0: authenticated
[ 82.961863] wlan0: associate with AP 00:c0:ca:1d:1b:d5 (try 1)
[ 82.976325] wlan0: RX AssocResp from 00:c0:ca:1d:1b:d5 (capab=0x411 status=0 aid=193)
[ 82.976333] wlan0: invalid aid value 193; bits 15:14 not set
[ 82.976338] wlan0: associated
[ 82.978167] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 83.003686] wlan0: disassociated from 00:c0:ca:1d:1b:d5 (Reason: 14)
[ 83.020069] wlan0: deauthenticating from 00:c0:ca:1d:1b:d5 by local choice (reason=3)

[Angel Abad (angelabad)]

In Gnome Bugzilla Dan Williams said:

Unfortunately this appears to be a driver error. It simply isn't able to
connect to the AP using the settings you've given it. The logs show a lot of
half-completed connections that then fail because the driver sends the
"disconnect" event. I think at this point you shoudl file a bug in your
distributions' bugzilla against the kernel with these logs and follow it up
there. They'll likely ask you to enable debug logging of the driver so that
they can see why the driver is failing to connect to the AP.

Thanks!

[j3t (jens-thielscher)]

For me works sometimes:
- right click taskbar icon
- disable wireless
- wait 5 seconds
- enable wireless again

[j3t (jens-thielscher)]

downgrade to the latest karmic kernel solves the problem for me

http://packages.ubuntu.com/karmic/i386/linux-image-2.6.31-20-generic/download

[haensel (christoph-hackel)]

a downgrade is never a solution! have you tried the following workaround?

http://forum.ubuntuusers.de/topic/intel-3945-wlan-bricht-ab-und-verbindet-sich-/?highlight=intel+corporation+pro+wireless+3945abg#post-2427198

[Mathieu Brethes (mathieu-brethes)]

Same problem here on 10.04 LTS with this wifi chip. Used to work flawlessly on 9.10... Am not moving to 10.10 until this is sorted out.

I'm not sure whether it is a driver problem or a network manager problem, however when I run :

sudo restart network-manager

Suddenly I can connect again. Usually the connection lasts for ~1hour, sometimes longer... It seems to be depending on the quantity of data transmitted. If I am into heavy downloading sessions, it stops in a shorter timeframe.

[Mathieu Brethes (mathieu-brethes)]

For some reason it doesn't seem to happen that much anymore. Go figure!

[Martín Fixman (martinfixman)]

I still have this problem.

[Mathieu Brethes (mathieu-brethes)]

To be adding more info: sometimes "restart network-manager" does not work and I need to unload/reload the two kernel modules iwl3945 and iwlcore so that I can get a connection again.

It seems to be most prone to crash when the signal strength is < 60% and when there are many outgoing connections at the same time, e.g. bittorrent traffic or internet surfing. It's actually (almost) stable when there are few connections, such as a single download by wget. I suppose that could lead to testing of some sort...

[Brad Figg (brad-figg)]

This bug was filed against a series that is no longer supported and so is being marked as Won't Fix. If this issue still exists in a supported series, please file a new bug.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.