intermittent wlan wireless not found on Intel Corporation PRO/Wireless 3945ABG

Bug #371267 reported by erzengel on 2009-05-03
12
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Undecided
Unassigned

Bug Description

on jaunty jackalope 9.04, with kernel 2.6.28-11-generic running, wlan can not be found or even be found periodically. driver is running, but wlan is not stable. wlan is available if using e.g. kernel 2.6.27-13-generic. it don't matter if using network-manager or wicd.

hardware: chipset intel 3945abg on laptop DELL inspiron 9400 superb

description: updated
description: updated

Thanks for reporting this bug. Is this an intermittent failure or is it completely non functional, as I can't understand which you mean. Can you connect to any wifi networks? Are you using specific encryption? Does the stability issue change when you use a non-encrypted connection? Also can you provide us with the following please:

1. Please include the output of the command "uname -a" in your next response. It should be one, long line of text which includes the exact kernel version you're running, as well as the CPU architecture.
2. Please run the command "dmesg > dmesg.log" after a fresh boot and attach the resulting file "dmesg.log" to this bug report.
3. Please run the command "sudo lspci -vvnn > lspci-vvnn.log" and attach the resulting file "lspci-vvnn.log" to this bug report.

Thanks again!

affects: ubuntu → linux (Ubuntu)
Changed in linux (Ubuntu):
status: New → Incomplete
erzengel (mathaeus-alice-dsl) wrote :

the wlan itself is working. about 10 min ago, when i started my computer. i had signal strength of about 77%. after restarting the computer, again no wlan could be found. and i just use WEP-encryption. i get wlan again when sitting right besides the wlan-modem-router in about 3m of distance.

here is uname -a:

Linux aimo-laptop 2.6.28-12-generic #43-Ubuntu SMP Fri May 1 19:27:06 UTC 2009 i686 GNU/Linux

erzengel (mathaeus-alice-dsl) wrote :

and here is lspci-vvnn.log

as you see, i use now kernel 2.6.28-12-generic, but with this it is alle the sam as with 2.6.28-11-generic

hello,

i just answered into the bug-report

thanks,

aimo

Teej schrieb:
> Thanks for reporting this bug. Is this an intermittent failure or is it
> completely non functional, as I can't understand which you mean. Can you
> connect to any wifi networks? Are you using specific encryption? Does
> the stability issue change when you use a non-encrypted connection? Also
> can you provide us with the following please:
>
> 1. Please include the output of the command "uname -a" in your next response. It should be one, long line of text which includes the exact kernel version you're running, as well as the CPU architecture.
> 2. Please run the command "dmesg > dmesg.log" after a fresh boot and attach the resulting file "dmesg.log" to this bug report.
> 3. Please run the command "sudo lspci -vvnn > lspci-vvnn.log" and attach the resulting file "lspci-vvnn.log" to this bug report.
>
> Thanks again!
>
> ** Package changed: ubuntu => linux (Ubuntu)
>
> ** Changed in: linux (Ubuntu)
> Status: New => Incomplete
>
>

Thanks for the additional info. So the wifi/wlan works perfectly every time you boot, and only fails after a reboot?

erzengel (mathaeus-alice-dsl) wrote :

no. you can not reproduce it. sometimes it woks, but most of cases it don't. i can refresh networks in wicd and no wlan can be found. normally when i boot, network connects to wired network because no wlan can be found. even on reboots its about a percentage of less than 10 that my wifi can connect to my wlan. it seems that my laptop lost a lot of signal strength to connect to my wlan. i didnt have had these problems since ubuntu 7.10 and they came up with upgrade from 8.10 to 9.04 with new kernel. it even didnt work with ndiswrapper and wifi-driver from windows. i have had the same problems. but i get connection to my wlan when taking my laptop and placing it in about 3m distance of my wlan-router. well, it seems as it lost a lot of connectivity-strength, like when cutting the antenna (what i did not).

So basically, it works better from a distance than up close? Perhaps the signal is being swamped by RFI? Are there any other routers/PCs in wifi range? Have you tried changing to a lower channel, as lower frequency gives better performance at longer distances. Thanks.

erzengel (mathaeus-alice-dsl) wrote :

no, the other way: in only works close to the router than from distance where my place to work is. and there are no other routers or pc in wifi range. and i also tried other channels but didn't got things better. i don't really think that there is a hardware problem as it used to work since 7.04 out of the box and i didn't change the place of the router or anything else that could cause this problem. it came up with upgrade from 8.10 to 9.04. may be i should try out a fresh install? could it be the upgrade-procedure that anything could be wrong now? the devil is in detail and sometimes hard to find.

It's doubtful that an upgrade will cause this kind of issue, although if it worked in Intrepid, there must be a reason. Can you try enabling the proposed updates and upgrade to the 28-12 kernel, and report back if this helps the issue? Thanks.

erzengel (mathaeus-alice-dsl) wrote :

i am already using kernel 2.6.28-12-generic (see my post 3 days ago), but it didn't help in any way.

tags: added: hw-specific
summary: - periodically or no wlan be found with 2.6.28-11-generic
+ intermittent wlan wireless not found on intel 3945abg
summary: - intermittent wlan wireless not found on intel 3945abg
+ intermittent wlan wireless not found on Intel Corporation PRO/Wireless
+ 3945ABG
tags: added: metabug
tags: added: likely-dup
removed: metabug
nandayo (casier) wrote :

exactly the same bug ! I cannot find any wifi network under jaunty with this wireless chip !

Sorry for not getting back to this, for some reason Launchpad didn't email me any updates.
Can you please run "apport-collect 371267" without quotes, let it have full access, and allow it to upload the information to the bug report. Thank you.

We are closing this bug report because it lacks the information we need to investigate the problem, as described in the previous comments. Please reopen it if you can give us the missing information, and don't hesitate to submit bug reports in the future. To reopen the bug report you can click on the current status, under the Status column, and change the Status back to "New". Thanks again!

Changed in linux (Ubuntu):
status: Incomplete → Invalid
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