Dave Russell, and only Dave Russell, could you please execute the following in
a terminal:
apport-collect 836250
** Changed in: linux (Ubuntu)
Status: Triaged = Incomplete
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I am not using Ubuntu but I suffer this problem with my Asus Zenbook
Prime (wireless is Intel Centrino Advanced-N 6235 (rev 24)). In short,
either of the following two actions fix the network slowness.
1. Disable 11n capability via `modprobe iwlwifi 11n_disable=1` or the
kernel boot option
In response to Georg's above comment, I also tested the options he
gives; neither bt_coex_active=0 nor sw_ctypto=1 does anything to help
the slow connection. However, `iwconfig wlan0 power off/on` is
effectively a work/don't work switch for 11n capability.
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** Tags removed: kernel-da-key
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking, packet loss and very
Just reporting that I have also had huge problems with the stability of
my Wi-Fi connection. The following fixed this so far:
sudo modprobe iwlwifi bt_coex_active=0 swcrypto=1
I am still getting excessive amounts of Tx excessive retries, but my
connection is fast and stable.
My environment:
I went back and did some testing on 3.2.0-30-generic and
3.4.0-030400-generic from the mainline PPA (both AMD64) and my results
are the same as I mentioned in #158. With the Linksys e3000, I get
very good performance and with the Buffalo WZR-HP-G300NH router, I get
unusable performance.
Both
I see that the assignee has been changed to nobody, and the activity
on this bug has died down. Is there no hope of this ever getting fixed?
My wifi is unacceptably bad on a majority of routers, especially (but
not only) public hotspots. Would it help if I put a $20 bounty on the
implemented
** Changed in: linux (Ubuntu)
Assignee: Tim Gardner (timg-tpi) = (unassigned)
** Changed in: linux (Ubuntu Oneiric)
Assignee: Tim Gardner (timg-tpi) = (unassigned)
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What are the disadvantages of iwlagn 11n_disable=1?
11n should theoretically give you higher throughput and interference.
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Title:
[Oneiric]
For me wireless is working again on 12.10, but I noticed the speed was only
about 12MB/s compared to 54MB/s on Windows 7. So i tried iwlagn 11n_disable=1
and it solved the problem, now I have the same speeds as on Windows 7.
What are the disadvantages of iwlagn 11n_disable=1?
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nh2, these commits have been merged to mainline for kernel version 3.4.3
(posted to mainline ppa on june 17). I think they have also been merged
to the 3.2 branch.
Unfortunately they did not help with this bug.
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@Karl Frisk: Oh, then cgit tricked me somehow, I thought they were just
merged yesterday. Sorry for the false alarm.
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Title:
[Oneiric]
This bug affects my laptop with Centrino Ultimate-N 6300 as well.
I think I have tried all the workarounds in this thread but the only
thing that helped was turning on the swcrypto parameter. My
/etc/modprobe.d/iwlwifi.conf now looks like this:
options iwlwifi 11n_disable=1 led_mode=1 swcrypto=1
In the Intel bug linked above
(http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=2315) they
posted two new patches about hardware bugs that seem to have gone into
the mainline Linux git yesterday.
Compile and try, anyone?
@zeitkunst
You are not alone in your frustration with university
Turning of ipv6 has worked (for at least the last 24 hours or so)
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
Using options iwlwifi 11n_disable=1 to turn off n networking hasn't
worked. It has successfully turned off n (leaving abg), but I still get
the deep sleep problem. I'll try turning off IPv6. I've also ordered the
following USB adaptor: Edimax EW-7811UN Wireless 802.11b/g/n 150Mbps
Nano USB Adaptor
My connection no longer constantly drops on a Thinkpad T410 with Intel
Corporation Centrino Ultimate-N 6300 (rev 35) wireless running mainline
kernel 3.5.0-030500rc6-generic.
Before running this kernel version, I could not connect to any of the
local networks (all wireless g), but now the
I'm having the same problem on a Lenovo x201 on a new install of 12.04
today. Previous 11.10 version had the same problem.
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Title:
[Oneiric]
The bt_coex_active fix not fixing this bug - N speeds persists, but IP
is jittering over 800ms - this incompatible whith any real-time
protocols.
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** Description changed:
This may be either network-manager or kernel, depending on triage...
I have verified this on both a Lenovo X201 and a Lenovo T500 laptop.
Both work perfectly with fully updated 10.10 and 11.04 versions of
Ubuntu.
However, booting into a fully updated
On my machine, I seem to have temporarily stopped this problem, although by the
lack of activity on this thread
it may be that in more recent kernels the problem is already fixed.
lspci shows my wireless card as
03:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300
(rev 35)
I
Re Comment: #225:
Ubuntu has the latest firmware versions in the Precise kernel. However,
I can confirm that the bt_coex_active fix works for me -- at N speeds
with out having to disable N
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I am glad to tell you to see the issue fixed (at least my version of the
problem, which concerns to an encrypted wpa2 network on an Corporation
Centrino Ultimate-N 6300) on Opensuse 12.2 beta 2. with kernel 3.4.2
output of uname -a:
Linux linux-84uj.site 3.4.2-1-desktop #1 SMP PREEMPT Thu Jun 14
I would like to add that I have a Lenovo laptop with an Intel Centrino Wireless
N (forget the model number) running Ubuntu 12.04 amd64 as well and that laptop
does not experience any of the issues that my Samsung laptop faces. This makes
me think that the issue might not be just a driver issue
@Paulo, thanks for the suggestion to disable ipv6 in the kernel boot
line. I couldn't connect to the router I'm currently on (at my
university), but since disabling ipv6 I now can. I also have 11n
disabled. The connection seems to occasionally drop, but picks straight
back up again. And I no
Aravind,
I also have problems with some b/g only routers and I have found two
related workarounds that have solved my problems with those specific
routers. In these cases the problem is with the IPv6 stack, so the
solution is to turn off IPV6. There are two ways to accomplish this:
1) Goto
The power management and wireless-n disable changes did not help. Disabling
IPv6 seems to have helped. I have still disabled power management and
wireless-n though.
Thanks pjssilva.
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Hi.
I have a Samsung laptop with Intel Centrino-N 130 wireless card. My wireless
router is a Netgear WGR614v7. It only supports b/g. So, even if I am connecting
to a 'g' network, my connection drops almost every minute and I have to disable
and enable wireless connections for it to reconnect.
I
Have you tried the solutions I report here:
-
http://cikitsa.blogspot.co.at/2012/03/t500ubuntu-1110-slow-wifi-network.html
On 14 June 2012 06:11, Turbo 836...@bugs.launchpad.net wrote:
Hi,
At first, I wasn't sure when started reading this -very long- post.
My daughter's laptop is a
Hi,
At first, I wasn't sure when started reading this -very long- post.
My daughter's laptop is a Samsung with (also) an Intel Centrino-N 130
wireless card. All this paired with Ubuntu 12.04 x64 full patched
several minutes ago. The wireless conection is failing frequently even
when she is at
The same issue for me, on Thinkpad x220t, Centrino Ultimate-N 6300.
Kernels 3.3-3.4
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Title:
[Oneiric] [Regression] Intel Corporation Centrino
An unfortunate warning to all Thinkpad owners: Lenovo is whitelisting
all of its radio components (supposedly due to FCC regulatory demand),
meaning your cannot switch you old Intel wireless adapter that easily
without getting a dreaded BIOS error telling you to check on the card
(i.e. the system
An unfortunate warning to all Thinkpad owners: Lenovo is whitelisting
all of its radio components (supposedly due to FCC regulatory demand),
meaning your cannot switch you old Intel wireless adapter that easily
without getting a dreaded BIOS error telling you to check on the card
(i.e. the system
I am also having the problem described here. I'm using an up-to-date
ubuntu 12.04, on a lenovo u300s, with Intel Centrino Wireless-N 1030
(rev 34).
I hope someone could help, this is driving me crazy. Thanks.
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I gave up on centrino and bought an atheros PCI express module.
SparkLAN 11abgn Atheros AR9382 half size minicard (WPEA-121N)
$35 bucks or so. This module is 2x2MIMO dual band, equivalent to
centrino 6200 (methinks), not 3x3.
Worked out of the box in ubuntu 12.04.
2028 packets transmitted,
I upgraded my HTPC with the top of the line centrino module...
Intel Corporation Centrino Advanced-N 6300
I was using 11.04 and seemed to work fine. Then I had the bad idea to
update to the latest ubuntu LTS 12.04.
only to find out that wifi works really poorly, much worst than the
cheap
I'm using a thinkpad t410s, I've noticed an improvement by turning power
management off:
/sbin/iwconfig wlan0 power off
If this works for you, put it in a file in /etc/pm/power.d to make it
permanent.
Disabling wireless n also works, but I have had a stable connection
using wireless n with
Is there anything happening with this bug? I've been suffering with
insanely slow WiFi speeds on my ThinkPad X220 for many months now, and I
feel as though no progress is being made here. I don't have the skills
to fix the bug, but I'm here for testing. To be honest, I'd even pay
money to see this
I can confirm that Fedora 16 since the 3.3 kernels also affect this bug. I
switched to Fedora because it seemed to be uneffected. I am working on a Lenovo
X220.
Is there a way to downgrade only the kernel in Ubuntu as workaround?
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Unfortunately, my solution in comment #203 doesn't work anymore; I now
get the dreaded denied authentication (status 17) even on the older
kernel mentioned in that comment. This happens on both open networks
and those using TTLS with PAP authentication.
Is there _any_ known working
Zeitkunst,
I have a problem with the router of my son's therapist, it uses WEP not
PAP. But I managed to solve it by using wicd instead of the network-
manager to control the network.
Try
sudo apt-get install wicd
It will install some packages (you don't need to uninstall network-
manager).
For me wicd also seems to work much better than Network Manager, thanks
for the suggestion.
I've now had an N connection running at my university for almost half an
hour at speeds between 80 and 120 Mb/s (WPA2 PEAP/MSCHAPV2). Tx
excessive retries is, however, in the tens of thousands, but at
Good. I have no problem to connect to my wifi network but to be sailing there
are times when it gets really slow, I fall, but my network gets slow and takes
too long to connect, I have to give several times a page in Ubuntu 12.04.
http://i.imgur.com/wc2Hz.png
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Any progress on this bug?
Or, any suggestions on how to downgrade (on Oneiric or Precise) to a
Natty kernel, since that doesn't appear to have this bug? The bug makes
it impossible to do any work on my campus' wireless networks.
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I can confirm that the latest Natty kernel I was able to find from the
Kernel Team PPA (http://kernel.ubuntu.com/~kernel-
ppa/mainline/v2.6.38.8-natty/), along with options iwlagn
11n_disable=1, has so far solved my wireless problems on Oneiric 64bit
with the following Centrino card:
[
#200: I see no reason why it shouldn't occur, it's an upstream driver
bug.
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N
Confirmed with Ubuntu 12.04 64bit and Intel Centrino Wireless-N 130.
Little hope this bug is going to be fixed...too much time without no interest.
Do you know if the issue occurs also in Fedora 16 64bit? Or in the other
distributions with the most updated kernels?
Thanks
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Hi guys,
Got Ubuntu 12.04 64 bits,
03:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N
6200 [8086:4239] (rev 35)
3: phy0: Wireless LANE
Soft blocked: no
Hard blocked: no
Even when set to disabled the n
sudo modprobe -r iwlwifi
sudo modprobe iwlwifi
This plug
http://www.amazon.com/gp/product/B003X26PMO/ref=oh_details_o00_s00_i00
with this driver
http://152.104.125.41/downloads/downloadsView.aspx?Langid=1PNid=21PFid=48Level=5Conn=4DownTypeID=3GetDown=falseDownloads=true
works on my T410i. I now can connect to my n router.
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This bug has been known about since last August and has persisted
through two releases. Is it ever going to be fixed or just ignored?
Thinkpad X200 dual booting Win 7/Mint 12 and now Ubuntu 12.04. Wireless
unusable under Linux unless I set my router to no encryption in which
case it works fine.
On 04/05/12 03:46, arsenix wrote:
.Is there any hope of using 802.11n under ubuntu? I make do
using my old 802.11g router .
I do, having having switched my 'n' router from WEP to WPA encryption -
now works fine all round my house ( 'g' works too but doesn't have the
range to reach
Can confirm behaviour and work-around.
HP Elitebook 2540p.
Xubuntu 12.04 installed.
Using the iwlwifi module.
Connection with a Netgear wireless access point running b/g absolutely fine
Connection to a WHR-G300N router has intermittent pings - and websites etc load
slowly.
Running:
# rmmod
I can confirm this bug still manifests in Precise identially as it did
in 11.10. Is there any hope of using 802.11n under ubuntu? I make do
using my old 802.11g router and many others are up and running by
disabling 802.11n but this is really just a bandaid for what seems to be
a larger issue.
indeed, it works! thanks.
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking, packet loss and very slow
thinkpad e420s with intel centrino n-1000: seems that the same problem
persists with 12.04; what's weird though is that I had fixed this on
11.10 disabling N-connections, and while I was able to do the same with
12.04, every time I reboot the connection turns terribly slow again.
change to WPA is
Ubuntu people can't write the patch for you - report upstream at Intel
(see the auto-bugzilla.intellinuxwireless.org #2315 link above, there
are only 3 people CC'd in their bugzilla compared to 140 here).
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ok, did this. anyways, in 11.10 it was possible to unable n-connnection by
echo options iwlagn 11n_disable=1 | sudo tee /etc/modprobe.d/iwlagn.conf
with 12.04, I have to enter this command every time I restart. don't know if
this belongs in a bugreport, though.
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Changing from 11.10 to 12.04, I've had success in regaining wireless speed
by changing
options iwlagn 11n_disable=1
to
options iwlwifi 11n_disable=1
Best,
DW
On 27 April 2012 20:33, b. eskararr...@yahoo.de wrote:
options iwlagn 11n_disable=1
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this bug is so old, why is there still no patch?
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking,
I just found out that setting my acces-point to WPA-PSK makes stuff
work.
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N
For people seeing better behavior after changing to WPA-PSK.
I was having the same problem in my system in the wating room of my
son's therapyst (which we visit twice a week). The router is configured
to use WEP and the connection would drop almost immediately. For obvious
reasons I can not
Hi,
me too
IBM Thinkpad X201i
When I disable 802.11n I am able to connect and surf. When N is
enabled I can associate with the AP but I have no DNS resolution.
Joey
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Steven, the adapter I am using was bought in the 'Value Range' by a UK
supplier (CCLOnline.com) but they explicitly state the 'Value' items are
not manufacturer specific/may change.
I did find on ebay 'Tenda Mini 54m Wireless USB Adapter W541U V2.0'
which looks about right.
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Playing around based on #173 I changed my hub from WEP (64bit) to
WPA/WPA2 (PSK) and it works - IT WORKS, IT WORKS
So we are left with
11.04: WEP (64 bit key) = Good, WPA/2 = Good
12.04: WEP (64 bit key) = V Bad (worse than dial-up speeds), WPA/2 = Good
(flat-line 9Mb/s, as per my ADSL
Follow-up on my own comment, #171: It seems that the problem is
improved, but not actually fixed as I had said before. There is a
definite improvement though. There are still plenty of networks on which
I experience problems and slowness. Rebooting my machine brings back
higher speeds for a while,
Also, can someone link to an amazon.com product page or some place to
buy the USB networking adapter that works perfectly? I can't find it
based on the information provided so far.
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#176 - Yes, as per my post #37 last October. I am still having to run
11.04 if I use the built-in Intel N-1000 hardware, (or boot 12.04 with
USB Raylink, which works great).
Note the N-1000 works fine on G only routers, but I need N turned on to get
coverage around my house.
Sorry I can't fix
Doug: Thanks for the comment noting that the USB Raylink works. It
might be interesting to know any other USB units that work, as a
temporary way for some people to get up and running. In my case, I am
purchasing multiple (10-20) units for a school. Some of the Raylink
models sell for $6-10.
Robert, my comment above was a bit vague (Raylink make a number of
models) so to clarify #178 lsusb reports:
Bus 001 Device 003: ID 148f:2070 Ralink Technology, Corp. RT2070
Wireless Adapter
And on the box: W541U v2.0
Working fine on 12.04 as I write this (but I have to select 'disconnect'
my
Hardware: Lenovo X220, Wifi: Intel Centrino Advanced-N 6205 AGN
Software: Ubuntu 11.04, problem on both 2.6.38 and 3.1.1 kernels
I want to confirm this problem on my hardware: Around 10% packet loss
with packets lost around every 5 seconds (easily observable in e.g.
ping's icmp_req counter
As per #172: With the newest kernels you are completely out of luck!
Also, This issue has to do with many components, it's not only the
kernel seems a correct observation.
I have this connection problem with an ASUS netbook 1016PT, ---network
card Intel Centrino Anvanced-N 6200. I can connect
UNREAL! Kubuntu 11.04 works instantly, out of the box with the ASUS
netbook 1016PT, network card Intel Centrino Advanced-N 6200.
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Title:
#173 is not completly true, 802.1X don't work to...
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking,
lunixhacker is right in my case, too. X201 with an Ultimate-N 6300.
Running Kernel 3.2.0-22 (64-bit)/12.04(Beta2). Same symptoms, on boot
wireless works for a few moments, then goes down to 1Mb/s until,
ultimately, the connection drops and re-connects into the same cycle.
Workaround from #164
I'm talking about an Intel Corporation Centrino Ultimate-N 6300
This problem is very strange. I have played around with this problem weeks and
weeks and have no solution. The work around of comment #164 works for me with
Kernel 3.0.26 and 3.1.0-1.2 but not with newer kernels as 3.3. This
I am running 12.04 on a HP EliteBook 8440p with Centrino Ultimate-N 6300
and have the same problem. Disabling N using Mirek's hack above has
worked for me.
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I am trying to apply Mirek's trick in post # 164, but I'm curious if
iwlagn is the same thing as iwlwifi? My wifi driver is listed as
iwlwifi. Should I modify the .conf file somehow?
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iwlwifi is a completely different driver than the iwlagn driver. You
might be experiencing a completely different bug. What network adapter
are you using?
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My adapter is the Intel Centrino Wireless N-1000 in a ThinkPad X220. I
filed a separate report, and someone marked it as a duplicate of this
one. My report is here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/939218
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Try the walkaround using your driver:
sudo rmmod iwlwifi
sudo modprobe iwlwifi 11n_disable=1
echo options iwlwifi 11n_disable=1 | sudo tee -a
/etc/modprobe.d/disable-n.conf
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The following workaround has solved my issue on my ThinkPad X220 with
Intel Centrino Wireless-N 1000 card using iwlwifi driver (except, of
course, that I don't have N wireless capabilities now):
1) Create a file at /etc/modprobe.d/intel_11n_disable.conf containing this one
line:
options iwlwifi
** Tags added: kernel-wifi
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking, packet loss and very slow
It seems that on my ThinkPad X220 with the Centrino Wireless N-1000 and
kernel 3.2.5, WiFi gets worse over time. Sometimes rebooting my machine
speeds it back up until it crawls to a hlat over time again.
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I can confirm this bug - Ubuntu 11.10 64bit. I'm using wifi card Intel centrino
advanced-n 6230 and the connection is VERY slow. When I try any other wifi card
with another chipset, it works fine (Atheros, Broadcom..).
This hack works for me:
Create a file /etc/modprobe.d/intel_11n_disable.conf
@Roy, don't think it's that, I (and others) have the same problem on an
Ultimate-N 6205, which is a 2x2 adapter
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Title:
[Oneiric] [Regression]
This could be a complete red herring, but on the off chance that it's
useful info:
I'm seeing this issue on an Ultimate-N 6300 in a two-antenna laptop
(with only antenna terminals 1 and 2 connected). This configuration
works fine under Windows, but causes high packet loss under Linux Mint
12.
Some problem with the intel iwl4965 driver. It occured with one of the last
updates.
Disabling N with sudo modprobe iwl4965 11n_disable=1 solves the problem.
I don't even have an N-capable router.
lshw reports:
configuration: broadcast=yes driver=iwl4965 driverversion=3.0.0-16-generic
Hi guys. I have a different wireless card:
Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE
Running
Linux alia 3.0.0-16-generic-pae #28-Ubuntu SMP Fri Jan 27 19:24:01 UTC 2012
i686 i686 i386 GNU/Linux
And I came across this thread because I have a ThinkPad x220i, and my wireless
After upgrading to kernel 3.0.0.16 I am able to connect my laptop at
150Mbps using iwlagn and my desktop at 300Mbps using rt2800pci. Both
speeds were not possible before kernel update.
The problem now is that my laptop connects in g speed (54Mbps) after
waking up from suspend. Have to reboot my
I also have an Intel Corporation Centrino Ultimate-N 6300 card in my laptop. I
tried everything, but no solution. Kernel 3.0 worked while I have the problem
since 3.1. Today I noticed something important:
All the problems only appear with encrypted wifi. I noticed that, because I
came across a
@ Comment # 156: It's very strange you say that. With my Intel Centrino
Wireless N-1000 card in my ThinkPad X220, I only see this problem on
UNencrypted networks, and never on encrypted ones (though I have only
tried a few encrypted networks).
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The variability of this problem is wicked.On a whim, I swapped out
my Atheros AR9132-based AP for a Broadcom based Linksys E3000 and my N
performance is much better now. It's still not as good as it should
be, but it's usuable now at least.
x220 with Centrino Wireless N-1000.
On a fresh installation of the daily ubuntu precise (actually yesterday)
I got the same problem with an Intel Centrino N 1030.
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Title:
[Oneiric]
Similar problem here with a netbook with Intel Centrino-N 130 and kernel
3.2.6-2 (Arch). Tried with both NetworkManager and Wicd. However, the problem
disappears with:
sudo rmmod iwlwifi
sudo modprobe iwlwifi
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Following the flurry of happy people above I tried 12.04 Daily Build (64
bit / 15Feb) again on my Atom 450 / Centrino -Wireless N1000 netbook and
still minimal connectivity (10s -100s B/s).
However using a Raylink RT 2070 usb dongle (148f:2070) I get 800+kB/s
just fine.
I didn't try backports,
Unfortunately, after a couple of days of testing, I cannot confirm that
the latest release of the backported modules fixes the issues described
in this report concerning the Advanced-N 6205 AGN. At best, and that is
without proper testing .. just a hunch, it went from unusable to
marginally
I have Centrino Wireless-N 1000 (8086:0084) and using linux-backports-
modules-cw- (and the iwlwifi module) and the performance has not
changed. It might even be worse :(
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Probably I'll never understand these ubuntu kernel packages and how they
relate. If I take a look at the changelog of yesterdays updates to my
machine via 'apt-get changelog linux-image-generic' you can see the
changelog entry which caught my attention:
linux-meta (3.0.0.16.19) oneiric-proposed;
Installed the linux-backports-modules-cw- package matching my kernel. Made no
difference...
I can still reproduce Bug 919579 with a 100% success rate.
Perhaps it's hardware dependant? Olaf mentioned a Ultimate-N 6300 AGN,
rkrizan Intel WiFi Link 5100 Intel Pro 4965AGN. I have a Centrino
Today I have good news. The problem seems to be fixed for me. I'm
running Oneiric on a Thinkpad T520 with a Ultimate-N 6300 AGN wireless
chipset. Today I got the ubuntu update notification announcing a new
kernel to be installed. As I reviewed the changelog I noticed that the
kernel was updated to
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