Upgraded to kernel 3.0.0.16 this morning, and thankfully have the same
results as @OlafGeibig. Connection is fast and stable, without disabling
11N.
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Nice! i've just upgraded to kernel 3.0.0.16 and removed options iwlagn
11n_disable=1 and it's working great. i'm getting 0% packet loss.
THANKS!
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Just upgraded, but unfortunately it's not fixed for me. Problem is still
exactly the same. See Bug 919579 for details.
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Title:
[Oneiric]
Did you actually install the relevant linux-backports-cw- package?
Just upgrading your kernel isn't going to work.
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Title:
[Oneiric] [Regression]
I've been following this bug pretty closely (I thought), but this is the
first mention I've seen of linux-backports-cw. Why does this package
solve the problem?
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Still having the problem, tried the 3.3.0 kernel, no change. Just
grabbed a tcpdump on the client side while attempting to ping the
default gateway.
Attaching below.
** Attachment added: tcpdump output
It's still broken! I just installed Precise on my Acer One netbook (
with Intel Corporation Centrino Wireless-N 1000) and connectivity is
unuseable (10's to k's of B/s).
Having found 11.10 unuseable (see #37) last October I rolled back to
11.04 until now. Disappointed 'cus I love 11.10/12.04
ps to #140 above, if it helps Thanks. D.
*-network
description: Wireless interface
product: Centrino Wireless-N 1000
vendor: Intel Corporation
physical id: 0
bus info: pci@:02:00.0
logical
** No longer affects: network-manager (Ubuntu)
** No longer affects: network-manager (Ubuntu Oneiric)
** No longer affects: network-manager (Ubuntu Precise)
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** Tags removed: kernel-key
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking, packet loss and very
Been discussing this again -- it's not a bug in NetworkManager, even if
it may be easier to trigger the bug if using it. Closing the task as
Invalid.
** Changed in: network-manager (Ubuntu Oneiric)
Status: Confirmed = Invalid
** Changed in: network-manager (Ubuntu Precise)
Status:
** Tags added: kernel-key
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking, packet loss and very slow
I also don't think the linux bug is the same as 'our' bug. I don't
see'fail to flush all tx fifo queues' in my dmesg. But I guess it would
be interesting for us to check out the above fix. Maybe it helps us,
too.
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** Changed in: linux
Status: Unknown = In Progress
** Changed in: linux
Importance: Unknown = Medium
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Title:
[Oneiric] [Regression]
** Changed in: linux
Status: In Progress = Fix Released
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
I really don't see how the above linux bug pertains to this issue in any
kind or form and thus wouldn't support the bug-watch-updater's choice to
mark it as 'Fix released'. All of the symptoms described in the
bugreport on the Intel bugtracker DO NOT show up in any comment of this
report.
**
Hello folks, anybody tried to compile kernel with
CONFIG_IWLWIFI_DEBUG=y
CONFIG_IWLWIFI_DEBUGFS=y
CONFIG_MAC80211_DEBUGFS=y
CONFIG_MAC80211_DEBUG_MENU=y
CONFIG_MAC80211_NOINLINE=y
CONFIG_MAC80211_VERBOSE_DEBUG=y
CONFIG_MAC80211_HT_DEBUG=y
CONFIG_MAC80211_TKIP_DEBUG=y
CONFIG_MAC80211_IBSS_DEBUG=y
I also have a Intel Centrino Ultimate-N 6300 card. Internet is working
with the 11.10 live cd. I didn't want to install and update 11.10 so I
took a 12.04 live cd version to test this issue and indeed an internet
connection is impossible. I can conect to my WPA/WPA2 router. It shows
that I'm
I believe I've found another interesting aspect to this issue. I
believe it is actually capable of forcing my Motorola Surfboard 6120
cable modem to reboot. When using a wireless connection to do a git
repo sync with Cyanogenmod (or anything that involves a substantial
download), my cable modem
I want to contribute the fact that I'm having the same issue with my
Lenovo x201 with ultimate N-6300 card. There's a wifi hotspot that used
to give me 1.5 to 2 mb/s dl speeds and now it can't even update package
lists. Here's what I thought would be of interest. This behavior first
manifested on
I'm at a loss as to how to debug this at the NetworkManager level.
Nothing is truly special there; what we do is basically just detect the
type of device to know whether to pass ap_scan=1 or ap_scan=2 to
wpasupplicant, which is what actually establishes and keeps the
connection up. Other code
My findings: right after boot there is no wireless connection. But after
rmmod iwlagn; modprobe iwlagn, all is fine. So even without adding
options iwlagn 11n_disable=1 to /etc/modprobe.d/.
System information:
Xubuntu 11.10
Linux safecracker 3.0.0-14-generic #23-Ubuntu SMP Mon Nov 21 20:34:47
for reference:
11n_disable=1: disable all of HT: MCS rates, TX/RX aggregation
11n_disable=2: disable TX aggregation (use MCS rates, RX aggregation)
11n_disable=4: disable RX aggregation (use MCS rates, TX aggregation)
11n_disable=6: disable both RX and TX aggregation (use MCS rates)
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Thanks Ryan. I was actually expecting 2 FAIL and 4 PASS (and 1/6 PASS
obviously), so it's good to know that it's the other way around.
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Title:
Yes I think it would be more interesting to test this on the 3.0.13 (or
so) that others are using already, we just recently had some bugfixes in
3.2-rc that wouldn't have propagated up yet.
The interesting thing would be having 3.0.x broken, fixed with
11n_disable=1 and then figuring out if it's
@johannes-berg
I have built a version of this patch against ubuntu-oneiric (3.0.0), you can
download it here:
http://people.canonical.com/~arges/lp836250/linux-3.0.0-15.24~lp836250v201112142229/
Attached is the patch I used for this build.
Thanks,
--chris j arges
** Patch added:
@christopherarges
Cool, thanks!
@all
Can whoever had this issue with 3.0.0-15.24 please use this and check which of
the 11n_disable=1,2,4,6 options helps?
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Here is my results:
Using Chris Arges' kernel (3.0.0-15.24):
http://people.canonical.com/~arges/lp836250/linux-3.0.0-15.24~lp836250v201112142229/
11n_disable=1: PASS
11n_disable=2: PASS
11n_disable=4: FAIL
11n_disable=6: PASS
11n_disable=6 seems to also give me the best performance. The other
Doing a few other ping tests, option 6 definitely gives me the best
performance. Pinging one of Yahoo.com's servers, with option 6, ping
times stay below 40ms. Using options 1 or 2, ping times vary between
40ms upwards to 130ms. Average ping time with options 1 and 2 is over
80ms.
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Same problem here. System76 laptop with Intel Centrino Advanced-N 6200.
Up to 20% packet loss. Seems like a driver issue.
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Title:
[Oneiric]
@Chris, thanks! Is that really 3.2-rcX as the version indicates?
@Ryan, did it work before with 11n_disable=1? I think we had some *new*
issues with some other 11n APs newly introduced in 3.2-rc that we're
just fixing now...
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@Johannes, The patched kernel didn't work even with 11n_disable=1. I had
to revert to 3.0.13 kernel to regain connectivity.
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Title:
[Oneiric]
@johannes-berg
This kernel version is based off of Linux 3.2-rc5, with some additional patches
on top.
I did a brief test on my T420, which does not exhibit problems with my n
wireless setup using older kernels. I was able to test 11n_disable=1 on it, and
it did in fact disable n wireless.
** Patch added: patch to selectively enable/disable HT features
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/836250/+attachment/2630901/+files/iwlagn-disable-agg.patch
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I have just attached a kernel patch, I'd appreciate if somebody could
try it out.
This patch was prepared against 3.2-rc kernel, and parts of it (the
changes in the iwl-mac80211.c file) will not directly apply to older
kernels as we moved some code around. Those parts should apply to iwl-
agn.c
The attachment patch to selectively enable/disable HT features 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 patch you can resolve
this situation
Dave Russell did some testing on his X201 with various kernel versions
and userspace tools. I'm attaching the results of this as a PDF.
From these results we see the following:
1) Works on Natty 2.6.38 (though a bit slower than expected)
2) Oneiric/Precise 3.0.0/3.2.0 do not work (very slow to no
@johannes-berg et all
I have built a version of your patch against ubuntu-oneiric for testing. You
can download the files here:
http://people.canonical.com/~arges/lp836250/linux-3.2.0-4.10~lp836250v201112132022/
Attached is the modified patch that I used to build.
To those that can replicate
I installed Chris Arges' patched kernel, and used the different values
as suggested by Johannes. Nothing worked. The network connection was
zero. It showed I was connected to my router, but I could not ping out
to anywhere.
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Hello everyone,
I can confirm this bug for my Thinkpad X220, running Xubuntu 11.10. Slow
(almost non-existent) wifi speeds on my home network (which is
configured for wireless-n). The work network (b or g speeds) doesn't
give any issues.
Running standard Xubuntu 11.10 with latest kernel
I have reproduced the issue on Precise. Marking as confirmed.
** Changed in: network-manager (Ubuntu Precise)
Status: Incomplete = Confirmed
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After reading through this chain, I'm not entirely sure what I
can/should do at this point to get a reasonably stable connection until
all of the fixes come through. I'm on a Dell Studio 1558 machine with
Intel Wireless card. When I start doing anything with any significant
download, my Netgear
Thanks to everyone that has commented on this bug. However, as Johannes
mentioned, there are allot of comments that talk about issues that are
unrelated to this bug.
It would be great if everyone that commented on this bug can ensure they
have the same issue, described in the bug description.
This bug is insane. I tried to make some sense of all the comments, and
there are *at least* three unrelated problems ...
Problem #1: my skype connection is randomly interrupted and using wicd fixes
it
This is likely caused by background scanning not going as smoothly as you think
-- I believe
Here's an updated capture of the spreadsheet which shows my findings
** Attachment added: image of performance test findings (update 2)
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/836250/+attachment/2625752/+files/wifi-debug-update2.png
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As you can see from the above... using wicd on oneiric provides a stable
connection even with N enabled. However also note from the spreadsheet
that the rate is limited to G speeds even when using wicd on Oneiric,
something that does not happen when using Network Manager on Oneiric.
I'm about to
Confirmed. Natty with Oneiric Network Manager (and deps) suffers from
the same performance problem as pure Oneiric.
Tested with 2.6.38-13-generic #52-Ubuntu kernel.
Will attach dpkg lists (before and after) and update log from network-
manager install/update from oneiric repos.
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Natty package list pre upgrade.
** Attachment added: nattypackagelist.txt
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/836250/+attachment/2625791/+files/nattypackagelist.txt
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Natty package list with oneiric network-manager installed.
** Attachment added: natty-with-oneiric-nm-packagelist.txt
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/836250/+attachment/2625802/+files/natty-with-oneiric-nm-packagelist.txt
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Apt log from update to oneiric network-manager
** Attachment added: delta-natty-to-oneiric.txt
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/836250/+attachment/2625803/+files/delta-natty-to-oneiric.txt
** Changed in: network-manager (Ubuntu Oneiric)
Status: Invalid =
@ Mathieu Trudel-Lapierre (mathieu-tl) wrote on 2011-10-24: #72
Given the weight of recent testing, the issue is indeed looking like a
userspace issue of some sort, potentially network-manager. Therefore I
have set the status of the network-manager task back to confirmed for
Oneiric.
I have
** Tags removed: kernel-key
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking, packet loss and very
@Dave Russell
Thanks so much for all the testing you performed!
After a long series of tests, it appears this is not a kernel
regression.
I believe Dave has a spreadsheet documenting all of the pass fail
scenarios, but here is a short list of the tests ruling out the kernel:
2.6.38-13.52 natty
What about the firmware packages? Intel's driver is loading a
proprietary firmware, isnt' it? That could very well be the relevant
part if we're looking for a userspace related changeset ..
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@Dave Russell,
I'd like to perform a kernel bisect to identify when this regression was
introduced. It would be good to first test some upstream kernels to
rule out any Ubuntu specific patches. Could you test the following
kernels and report when the issue starts happening(And if it happens
1. Fails to boot - Kernel BUG : unable to handle kernel null pointer
dereference
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Title:
[Oneiric] [Regression] Intel Corporation Centrino
Thanks, Dave.
If both kernel tests 1 and 2 have show symptoms of this bug, can you
test:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.38.8-natty/
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Equipment: Laptop Lenovo X201 with Intel Corporation Centrino
Ultimate-N 6300 (rev 0x74)
Wireless Router Belkin
Environment Router in room below, many devices connected.
As the text is fairly ugly and the spaces got stripped out, here's an
image of my findings.
** Attachment added: image of performance test findings
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/836250/+attachment/2623933/+files/networkperformance.png
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As the text is fairly ugly and the spaces got stripped out, here's an
image of my findings.
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Title:
[Oneiric] [Regression] Intel Corporation
** Changed in: linux
Status: Confirmed = In Progress
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
I added the watcher on the upstream bug. I have not such card but discovered it
trying to help a user on ubuntuforums.
Hope it helps...
** Bug watch added: bugzilla.intellinuxwireless.org/ #2325
http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=2325
** Also affects: network-manager via
** Changed in: linux
Status: Unknown = Confirmed
** Changed in: linux
Importance: Unknown = Critical
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Title:
[Oneiric] [Regression]
Im having to rollback because of this bug :(
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking, packet
For what its worth, I have same symptoms on thinkpad t410i, but
disabling 11.n protocol doesn't help. I have two wireless routers, one
only has b/g and connects fine. The other has b/g/n, and I have tried to
disable 'n' on router side as well as on laptop side with the module
optoin, and it still
I upgraded to the latest stable release of the 3.0.x series kernel,
3.0.10. For testing I removed the line options wlagn 11n_disable=1
from options.conf in /etc/modprobe.d/ and reboot into the new kernel.
This problem still persists in the latest 3.0.x series kernel. I re-
added the options for
I wonder if I shall turn my 11n off as long as this isn't fixed. I can
connect to my AP without problems and the connection never drops, but I
also have these excessive retries in 11n mode. When connected in g mode
I have faster pings but network transfer is slower when copying a file
by FTP from
same problem on Dell latitude E6220. Intel advanced-N 6205. wireless
network i s useless - slow and drops out every 5-10 minutes. works
perfectly in windows 7.
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My laptop has an Intel Corporation Centrino Advanced-N 6205 (rev 34).
I am running Oneiric with 3.0.0-13.
I have just tested with a router that has a/g/n capabilities, and
if I turn on N, I can connect to the AP, but seem to have no connection (cannot
load webpages).
If I turn on a/g wireless,
@Chris J Arges, Can you try installing the latest stable kernel and try
to duplicate your results? You can download the kernel packages from
here: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.1.1-oneiric/
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** Tags added: kernel-da-key
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Title:
[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking, packet loss and very
** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream
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Title:
[Oneiric] [Regression] Intel Corporation Centrino
I upgraded to the latest stable release of the linux kernel, 3.1.1, and
removed the options.conf file and booted into the new kernel. The
problem was still there. I re-added the 11n_disable=1 option in
options.conf and rebooted still using the 3.1.1 kernel. The network
connection speeds were good
** Summary changed:
- [Oneiric] Intel Corporation Centrino Ultimate-N 6300 poor networking, packet
loss and very slow Lenovo X201 and T500 laptops
+ [Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor
networking, packet loss and very slow Lenovo X201 and T500 laptops
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