** No longer affects: linux (Ubuntu Maverick)
** No longer affects: linux (Ubuntu)
** Project changed: linux => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: High => Undecided
** Changed in: linux (Ubuntu)
Status: Won't Fix => New
** Changed in: linux (Ubuntu)
Remote
** Changed in: linux (Ubuntu)
Assignee: Andy Whitcroft (apw) = (unassigned)
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Title:
Slow Wireless Connection in Intel 3945abg
To manage
Declined for Maverick as EOL - Won't Fix.
** Tags added: needs-kernel-logs
** Changed in: linux (Ubuntu Maverick)
Status: Incomplete = Invalid
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Errico Picchiarelli, this bug was reported a while ago and there hasn't
been any activity in it recently. We were wondering if this is still an
issue? If so, could you please test for this with the latest development
release of Ubuntu? ISO images are available from
Since I'm using my spare again, I figured I'd chime in.
I get my full 22Mbps with Precise/Quantal.
Not sure about older releases.
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Title:
Slow
I've been inactive for a long time but here I come again and see people still
having the same problem.
I was one of the first (if not the first) to discover that Network Manager was
causing or at least augmenting the problem. It's a pity neither Network
Manager's nor Intel's team did anything
It has been some time since I posted here, but I finally took the time
to update to 12.04. I did a clean install and had the same slow Wi-Fi
problem out of the box. So I can confirm that Bug #621265 affects Ubuntu
12.04 Precise Pangolin too. I then did the same change documented
previously of
Arg!!! I gave up with 10.10... So I'm testing now 12.04... IT'S
WORST Now I can connect barely at 20Kb/s! I cant believe it!!!
Tried different things without luck...
My new info:
uname -a
Linux dvanzo-Vostro-1500 3.2.0-24-generic-pae #37-Ubuntu SMP Wed Apr 25
10:47:59 UTC 2012 i686
I confirm that replacing NetworkManager with Wicd resolv problems with
slow speed on my wifi intel 3945ABG
wifi card spec:
10:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222] (rev 02)
System: Linux Mint Kathya
Kernel:
** Tags added: kernel-wifi
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Title:
Slow Wireless Connection in Intel 3945abg
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Dvanzo,
In comment #362 was told that the fixes are specific for a subsystem. You have
the same subsystem that I have, 8086:1020 so my fix in #382 should work for
you. If you are on Ubuntu version 11.10 then I think all you need to do is
setup the disable_hw_scan=0 as described in #370.
Sebastian,
I have a different subsystem then you. Search in this bug for people with the
same subsystem,
Intel Corporation Device [8086:1010] as you have and see what they did to get
it to work.
If you have made a lot of changes, I would also suggest starting over
and booting a live CD and
Workaround #372 worked for me as well. No more speed drops since then.
Big thx to Simon and his source.
Just a little note. If you have your wireless network with hidden SSID,
it can take long time to connect to the network after being disconnected
(long time means ~25mins, at least in my case).
I'm very frustrated too... The Won't Fix status didn't make me happy
neither...
Just in case, my info:
dvanzo@dvanzo-Vostro-1500:~$ lspci -vnn |grep -A3 Wireless
0c:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222] (rev 02)
sebastian@gucky:~$ lspci -vnn |grep -A3 Wireless
03:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4227] (rev 02)
Subsystem: Intel Corporation Device [8086:1010]
Physical Slot: 3
Flags: bus master, fast devsel,
Sebastian and Aleksei,
Can you run the following commands from a terminal and provide the following
output?
lspci -vnn |grep -A3 Wireless
uname -a
lsb_release -rd
I was told that there are a few different issues depending on what
subsytem your machine has.
I was very frustrated with this bug
** Tags added: oneiric
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Title:
Slow Wireless Connection in Intel 3945abg
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Sebastian Wiesinger (sebastianw) wrote on 2012-01-06:
the same. Acer Aspire 5670, at MS Windows it works just fine - where is that
good driver???(((
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I have (probably) the same problem on a Thinkpad T60 with iwl3945. When
I modprobe the iwl3945 module, I have full speed for around 5-10 seconds
and then it breaks down to 0. I can still use the network, browse and
open ssh connections but opening pages is slow on firefox and ssh
connections
** Changed in: linux
Status: Confirmed = Won't Fix
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Title:
Slow Wireless Connection in Intel 3945abg
To manage notifications about this
I thought I'd share my experience with this bug. When I upgraded to
Ubuntu 11.10 I discovered I had a slow wireless connection, and after a
bit of searching around found this page. The disable_hw_scan=0 fix in
#370 seemed to fix my problem, but like others I was getting loads of
Microcode SW error
On my Ubunt 11.04 machine, I installed
linux-backports-modules-cw-3.0.0-natty-generic
which gave me the new wireless modules without having to update to the
latest Linux 3.0 kernel.
I also had to setup the disable_hw_scan=0 as described in #370.
creaate this file,
Hi guys
just to clarify, it was not me who found out about disable_hw_scan=0, but the
guy who let me know about it wanted to remain anonymous.
Anyways, I am glad it helps.
Btw, I removed network-manager completely and replaced it by wicd, did
not see a single Microcode SW error detected.
Sidebar: This issue is one I only had with Alice routers (1121 -- German
description: http://www.alice-wiki.de/Alice_Modem_1121_WLAN ) at my
friend's places. No issues whatsoever with Linksys WRT54GL routers at my
home or work.
Anyhow, Simon's fix (
Thank you Simon for the fix at #370 This was something I noticed for
over a year, but thought it was because my crappy router/dsl connection.
BTW my hardware is an ASUS Z53 Laptop. Core2Duo 5600 (Motherboard same
as model F3JC)
My output:
lspci -vnn | grep -A3 Wireless
03:00.0 Network controller
I've using it for a week and I can say workaround in #370 is doing great
in my laptop with Ubuntu 11.10. Thank you Simon. A lot.
lspci -vnn |grep -A3 Wireless
05:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222] (rev 02)
Simon, thanks for workaround. It works great!
This bug should be nominated to oneiric. Looks like regression for me. I've
never had problems with this card from my first version of Ubuntu: 8.04! Since
I've upgraded from 11.04 to 11.10 I'm getting this error:
Nov 3 20:05:14 konrad-laptop kernel:
Thanks Simon! Solution in #370 seems to work for me
root@laptop:~# lspci -vnn |grep -A3 Wireless
02:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222] (rev 02)
Subsystem: Intel Corporation Device [8086:1041]
Flags: bus
Thanks a bunch Simon, i was finally able to solve my problem under Linux
Mint Debian Edition x64, with a kernel 3.0.. Sorry to barge in the
Ubuntu bug reports, but i had to say thanks.. Actually my download speed
has improved even compared to when the wireless card was driving
properly, i'll look
Solution in #370 seems to work for me. This is the first fix after YEARS of
slow linux wifi (forcing me back to windows)!! And it was so simple
In the past I was able to recover high speed by disabling and enabling the wifi
interface. However, after some minutes it still became slow again.
Oh and I also have the Microcode error. It also comes in different
intervals.
xxx@ubuntu:/$ dmesg | grep Microcode
[39637.407134] iwl3945 :06:00.0: Microcode SW error detected. Restarting
0x8208.
[39658.562063] iwl3945 :06:00.0: Microcode SW error detected. Restarting
0x8208.
Solution in post #370 works (almost) for me (i've tried other supposed
solutions on internet but nothing worked)
I say almost because on win7 x64 I have speeds of 7540 kbps in download
Before trying steps in post 370 I obtained 721 kbps after I obtained 4566 (so
it is at least usable even if not
I have a dell inspriron E1505 that uses intel 3945abg..I experienced
this internet speed problem when I did clean install of Ubuntu 11.10..I
tried a bunch of fixes around the community but nothing helped..I kind
of gave up and accepted that I would have to wait for an official patch
so that was
configuring the iwl3945 module with disable_hw_scan=0 fixes the speed
regression problem for me on 3.0.0
but i still see the Microcode SW error detected. Restarting
0x8208. problem, in regular intervals, either 40 or 100 or 120
seconds
anyone still affected by the speed regression, try
my slowdown problem as reported on #344 persists with the new
3.0.0-12-generic kernel
with old compat-wireless as described in #353 i have full speed
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but now i see many of these in dmesg, probably the result of hacking up
old compat-wireless to run on new kernel is not perfect:
[ 306.571422] iwl3945 :04:00.0: Microcode SW error detected. Restarting
0x8208.
[ 306.571434] iwl3945 :04:00.0: Loaded firmware version: 15.32.2.9
[
I also experiment slowdowns under 10.04.3 with 3945ABG, usually after
several minutes (5 to 10mn) full speed download (about 700-800 KB/s,
upper limit of my ADSL connection, that can be reached with some
torrents).
The only thing I notice in syslog is such kind of messages every minute or so:
William,
Thanks for the help. Can you or anyone else give me a link on how to apply the
patch that is mentioned in #270?
That is this patch, 0001-iwl3945-remove-plcp-check.patch.
Do I apply it to compat-wireless program or the kernel?
Thanks,
Andy
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I rebooted after installing wireless driver, i mean executed sudo
reboot after sudo make install. It was fully ok then. After that i
installed nvidia.
After regenerating initrd couple of times, now it seems ok. it connects
in a snap (1-2 seconds). Internet speed is full, but speed in local
I was also affected by this bug.
laptop: Hp pavilion dv6000
os : ubuntu 10.10 amd64
$uname -a
Linux ruet-HP-Pavilion-dv6700-Notebook-PC 2.6.35-22-generic #33-Ubuntu SMP Sun
Sep 19 20:32:27 UTC 2010 x86_64 GNU/Linux
Tried ndiswrapper with both xp's and vista's driver, device not
present not
@Andy
It looks like my instructions may not work for your subsystem, 8086:1020.
Nobody that posted success and published their output from the lspci command
shows that version. Post #278 had succes with that subsystem and the kernel
from #270.
@Sarim
Glad to hear they are working for somebody.
@William Thank you.
But i got a bad news, after solving this wifi problem, i installed the
propitiatory nvidia driver.
sudo apt-get install nvidia-current
after installing nvidia-current the wifi doesn't connect. It remains in
connecting state for long time then ask for WEP password again,
I doubt the Nvidia driver did that. Most likely rebooting was what
caused that. As it has been mentioned before sometimes it can get
normal speeds for some time and then all of a sudden get really slow.
Rebooting usually either makes it better or worse.
On 09/30/2011 10:03 PM, Sarim Khan wrote:
William here is the output you requested,
lsb_release -rd
Description:Ubuntu 11.04
Release:11.04
uname -a
Linux d630 2.6.38-11-generic #50-Ubuntu SMP Mon Sep 12 21:18:14 UTC 2011 i686
i686 i386 GNU/Linux
lspci -vnn | grep -A 1 Wireless
0c:00.0 Network controller [0280]: Intel
@Andy Would you post the output of the following commands:
lsb_release -rd
uname -a
lspci -vnn | grep -A 1 Wireless
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Title:
Slow
I tried both compat-wireless-2011-03-18.tar.bz2 and compat-
wireless-2011-03-29.tar.bz2 following instructions in comment #353 but I
still have a slowdown after a while using the wireless.
I had switched to the ndiswrapper and the windows driver and the speeds
were always fine. However, the
Same problem with intel 3945ABG and kernel 2.38.11
Followed instructions from post #352 with compat-wireless-2011-03-29 and seem
to work ok now.
Should be update download link to:
http://linuxwireless.org/download/compat-wireless-2.6/compat-wireless-2011-03-18.tar.bz2
$ uname -a
Linux hp_nx9420
The attachment The patch copied from Redhat's bugzilla. (0002-iwl3945
-remove-check_plcp_health) of this bug report has been identified as
being a patch. The ubuntu-reviewers team has been subscribed to the bug
report so that they can review the patch. In the event that this is in
fact not a
I wrote a shell script to download and build each compat-wireless
version. I have attached the script for anyone that wants to see it. For
maintenance purposes, the script removes the downloaded .bz2 files and
any decompressed version that failed to compile with my current setup. I
reviewed the
My ISP finally got my connectivity back to at least to half of what I am
paying for so I was able to do some more testing. The results were not
favorable, and the compat-wireless-2011-08-27 is still slow again. I was
able to recover back to true speeds with compat-wireless-2011-03-18
after
Oops. Fix the tar and cd commands to use the 2011-03-18 instead of
2011-08-27 in my previous post.
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Title:
Slow Wireless Connection in Intel
I just updated to the latest Ubuntu kernel and had the same slow
connection that everyone else is reporting.
I downloaded the latest compat-wireless source and followed the same
rough instructions I posted in #298:
$ mkdir -p ~/Downloads/compat-wireless
$ cd !$
$ wget
Fresh install of 11.04, problem still around.
lspci -vnn | grep -A 1 Wireless
10:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222] (rev 02)
Subsystem: Hewlett-Packard Company Compaq 6710b or nx9420 Notebook
[103c:135c]
uname
dmesg | grep iwl
iwl3945: Intel(R) PRO/Wireless 3945ABG/BG Network Connection driver for Linux,
in-tree:s
[ 12.654837] iwl3945: Copyright(c) 2003-2010 Intel Corporation
[ 12.654910] iwl3945 :10:00.0: PCI INT A - GSI 17 (level, low) - IRQ 17
[ 12.654926] iwl3945 :10:00.0: setting
the problem in still present in kernel 3.0
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Title:
Slow Wireless Connection in Intel 3945abg
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I can confirm, Kernel 2.6.38-10 performs very bad, but Kernel 2.6.38-8
works fine. Whatever happened between those releases broke it again.
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Title:
Confirming the bug has returned in 2.6.38-10 (download speed 1Mbit/0.1MB per
sec).
Reverting to 2.6.38-9 kernel restores full Wifi speed (download speed
20Mbit/2MB per sec).
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On 24 July 2011 08:10, JohanF 621...@bugs.launchpad.net wrote:
Confirming the bug has returned in 2.6.38-10 (download speed 1Mbit/0.1MB
per sec).
Reverting to 2.6.38-9 kernel restores full Wifi speed (download speed
20Mbit/2MB per sec).
... deja vu - and not for the first (or even the
I can confirm finding from Jan Frybort on commtent 342.
$ lspci | grep 3945
04:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan]
Network Connection (rev 02)
With .38-8 i have internet download speed around 240 kbyte/s, with
.38-10 max 40 kbyte/s.
See attached a kern.log
This bug is back in Natty with 2.6.38-10. I can confirm it too.
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Title:
Slow Wireless Connection in Intel 3945abg
To manage notifications about
I upgraded to 2.6.38-10 the day it came out and I didn't have any
trouble with it. Last night I did a BIOS update on my Acer Aspire 5920
and then this resurfaced. I can also confirm that by backing out to
2.6.38-8 also works for me.
Upon reading the release notes, there seems to have been several
This bug started to affect me after a recent kernel upgrade in 11.04
from 2.6.38-8 to 2.6.38-10. If I boot with the previous kernel version,
the performance is normal again.
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In both Maverick and Natty I can use this card with the full 4 Mbps (500
KB/s) of my connection.
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Title:
Slow Wireless Connection in Intel
@Goalie: Ekhm, this bug is about 3945, not 5300.
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Title:
Slow Wireless Connection in Intel 3945abg
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Still broken out of the box in the 11.04 release. Disappointing.
$ uname -a
Linux ubuntu 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686
i686 i386 GNU/Linux
$ lspci -vnn | grep -i wifi
0c:00.0 Network controller [0280]: Intel Corporation Ultimate N WiFi Link 5300
[8086:4235]
Hi, I did a try to the new 2.6.38.2 kernel from here
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.38.2-natty/
and it also seem to solve the problem. So I'm going to handle it for some more
hours, and than remove and --purge the patched kernel version from #270.
By the way, because the
@Castelli: Surely it will. Moreover, .38 provides workaround for my bug
(effective disabling of hardware scanning).
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Title:
Slow Wireless
#334 is working for me too. Finally, I don't have to choose between
security and net speed.
Thanks, William :)
$ lspci -vnn | grep -A 1 Wireless
05:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222] (rev 02)
Subsystem: Intel
I can confirm that the instructions mentioned by William Scheidegger
(thanks a lot !!!) in post #334 work after updating the kernel to
2.6.35-28.
$ lspci -vnn | grep -A 1 Wireless
06:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222]
I just updated to the latest Ubuntu kernel and had the same slow
connection again.
--- From http://www.bandwidthplace.com/
Download Speed: 1149 kbps (143.6 KB/sec transfer rate)
Upload Speed: 637 kbps (79.6 KB/sec transfer rate)
Sat 19 Mar 2011 10:02:36 AM CST
I downloaded the latest
I can confirm that installing the kernel here (now obsolete):
http://people.canonical.com/~apw/lp621265-maverick/
- fixed the problem on a Fujitsu-Siemens V5545 having an Intel Wireless
3945ABG chipset.
No other solutions posted above worked for me.
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DELL D620, the same bug for a long time..
Maybe another thing, can be in touch with this bug, I usually don't turn off
the laptop, I use suspend to RAM.
But occasionally, randomly, once in 3-4 tries, the wifi after wake-up is not
able to get IP or to login,
I use WPA, mixed a/b/g.
So I don't
I don't have a radeon but a nvidia card using nouveau - yes i can
disable kms there too - but it does not fix this bug, at least it does
not do this for me.
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Yeah, forgot to say that I had an ATI, which would lead you to the
conclusion you just reached...
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Title:
Slow Wireless Connection in Intel
@s0undt3ch:
Are you sure with your workaround radeon.modeset=0 for this bug?
I mean - thats a kms radeon switch - graphic stuff - not a wireless one - and
this really helps?
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@ Torsten Krah
I don't remember where I previously saw this, but I had this issue
before maverick and back then the info available stated that it was some
IRQ issue between the graphics and the wireless card, the intel wireless
card being the culprit.
So previously I hardcoded that switch in
Ever since I updated to latest security update I couldn't use the
wireless compat modules from http://wireless.kernel.org/. So, with the
regular modules, If I watch a video from an NFS mount on my network,
I'll loose the wireless connection. I have to disable and then re-enable
wireless to gain a
@Andy Whitcroft and others
Today I did some security-update, among which kernel 2.6.35-27 that overwrite
the #270 one. So the problem is back.
We can't hold disabled security update, so we could block that packages, but
maybe you could also upload a new kernel...
please. M
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report: I tried both #323 and #321
#323 improved but not by much
#321 restored the throughput to the old values, but with much longer and
deeper drops than #270, so I reverted to #270 again and choose to ignore the
security patch for now.
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03:00.0 Network controller [0280]: Intel
Just to update this after, my speeds are still stable several days of
continuous operation.
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Title:
Slow Wireless Connection in Intel 3945abg
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William, thanks for your suggestion, they were useful for me.
I have a doubt, instead of following your advice to download compat-
wireless-2011-03-03.tar.bz2 I executed:
sudo apt-get install linux-backports-modules-compat-wireless-2.6.36
-maverick-generic
Is that a similar solution? It raised
@CarlosRuiz_globalqss This is deffinately a similar solution. If you are
still not noticing speeds that you would expect, there are several
reasons that could be causing it. I was batteling my WAN connection
during testing, so I always had to double check with a machine running a
different OS.
If
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Title:
Slow Wireless Connection in Intel 3945abg
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I just updated to the latest Ubuntu kernel and had the same slow
connection. I then went and downloaded the latest compat-wireless source
from:
http://wireless.kernel.org/download/compat-wireless-2.6/compat-
wireless-2011-03-03.tar.bz2
After following the same rough instructions I posted in
So a security update for the kernel has arrived on Maverick which is
linux-image-generic-2.6.35-27.48
I have the 2.6.35-27 kernel posted in #270 . Correct me if wrong, but I
do not think those changes have been integrated in the update.
Since it is a security fix, not a standard bug fix update,
As they were obsoleted, I deleted #236's and #237's patched kernels from
my site.
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Title:
Slow Wireless Connection in Intel 3945abg
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Just thought I'd post my experience with this bug and testing out the
potential fix.
I have the following configuration:
nandan@nandan-Aspire-5920:~$ lspci -vnn | grep -A 1 Wireless
06:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222]
uname -a
Linux mylaptop 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:48 UTC 2011
i686 GNU/Linux
lspci -vnn | grep -A 1 Wireless
03:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222] (rev 02)
Subsystem: Intel Corporation
@enedene: You must have the same problem I do! Try #250. It helps me.
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Title:
Slow Wireless Connection in Intel 3945abg
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Finally, thanks for the FIX and for the instructions. I can confirm that
this patch provided from Redhat significantly improves the speed with my
Intel 3945 wireless.
Before I got about 240 kb/s and after applying the patch I get 1400 kb/s
(about same speed as with Windows), it sometimes drop to
$ lspci -vnn | grep -A 1 Wireless
05:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222] (rev 02)
Subsystem: Intel Corporation PRO/Wireless 3945ABG Network Connection
[8086:1001]
Flags: bus master, fast devsel, latency 0,
** Attachment added: From lan speed test
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/621265/+attachment/1865819/+files/256MB.empty.lan.log
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** Attachment added: From wireless distro module speed test
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/621265/+attachment/1865820/+files/256MB.empty.distro.log
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** Attachment added: From wireless compat module speed test
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/621265/+attachment/1865821/+files/256MB.empty.compat.log
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I have now used #270 for 6 days, and I still get about 7Mbit/s down and
0.64Mbit/s up. These number are what I could expect from my ISP. I get
the same speed by testing the from my MacBookPro.
#270 surely works for my system and I am very happy!
espenbe@ministerial:~$ uname -a
Linux ministerial
I seem to be getting lower performance from the compat driver then from
the #270 kernel alone. Leaving computer on to see it although
performance seems worse the connection keeps stable unlike what happened
with the new kernel alone. Any other suggestions?
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When something get fixed, something can be broken. I've realised today
that with #270 kernel, my laptop can't be suspended, it just get hanged
and the only solution is to power off laptop by releasing battery or by
long-pressing the power button (it does not respond, the only thing I
see is the
Andy, what information is still needed to get this bug from Incomplete
to the Ubuntu kernel?
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https://bugs.launchpad.net/bugs/621265
Title:
Slow Wireless Connection in Intel 3945abg
I installed #270 and it does not work yet. Speed still drops down to
150KiB/s
sudo lspci -vnn | grep -A 1 Wireless
0b:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG
[Golan] Network Connection [8086:4222] (rev 02)
Subsystem: Intel Corporation Device [8086:1021]
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After moving the folder without problems on #295 I went to bed and left
the laptop on. About 10 to 12 hours later I get to the laptop, net
responsiveness is shitty, so is the speed, I tried to reconnect without
any luck at all. So I guess my problem is not yet solved. Oh forgot to
tell, the move
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