[Bug 299468] Re: Intel wireless (iwlagn) poor performance, bugs, crash on ThinkPad X200s

[Jeremy Foshee]

This bug report was marked as Incomplete and has not had any updated
comments for quite some time.  As a result this bug is being closed.
Please reopen if this is still an issue in the current Ubuntu release
http://www.ubuntu.com/getubuntu/download . Also, please be sure to
provide any requested information that may have been missing.  To reopen
the bug, click on the current status under the Status column and change
the status back to "New".  Thanks.

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** Tags added: kj-expired

** Changed in: linux (Ubuntu)
   Status: Incomplete => Expired

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[Bug 299468] Re: Intel wireless (iwlagn) poor performance, bugs, crash on ThinkPad X200s

[Erno Kuusela]

I actually tried the karmic alpha 4 cd yesterday. The crash and lag were gone, 
but wlan still didn't  associate
on 5 GHz (same ssid on 2 ghz and 5 ghz). I didn't try manual ap selection with 
iwconfig.

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[Bug 299468] Re: Intel wireless (iwlagn) poor performance, bugs, crash on ThinkPad X200s

[kernel-janitor]

Hi Erno,

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? Can you try
with the latest development release of Ubuntu?  ISO CD images are
available from http://cdimage.ubuntu.com/releases/karmic .

If it remains an issue, could you run the following command from a
Terminal (Applications->Accessories->Terminal).  It will automatically
gather and attach updated debug information to this report.

apport-collect -p linux 299468

Also, if you could test the latest upstream kernel available that would
be great.  It will allow additional upstream developers to examine the
issue.  Refer to https://wiki.ubuntu.com/KernelMainlineBuilds .  Once
you've tested the upstream kernel, please remove the 'needs-upstream-
testing' tag.  This can be done by clicking on the yellow pencil icon
next to the tag located at the bottom of the bug description and
deleting the 'needs-upstream-testing' text.  Please let us know your
results.

Thanks in advance.

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inappropriately; please just reply to this message indicating so.]


** Tags added: needs-kernel-logs

** Tags added: needs-upstream-testing

** Tags added: kj-triage

** Changed in: linux (Ubuntu)
   Status: New => Incomplete

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[Bug 299468] Re: Intel wireless (iwlagn) poor performance, bugs, crash on ThinkPad X200s

[Erno Kuusela]

I can confirm advice from 
 that following the
instructions at , namely "sudo 
apt-get install linux-backports-modules-jaunty", fixes the performance problem.

I hope this can be made to work for Jaunty out of the box?

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[Bug 299468] Re: Intel wireless (iwlagn) poor performance, bugs, crash on ThinkPad X200s

[Erno Kuusela]

The same performance problem has been discussed by many people at
.

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[Bug 299468] Re: Intel wireless (iwlagn) poor performance, bugs, crash on ThinkPad X200s

[Erno Kuusela]

BTW why does the bug report title say "Bug #299468 is not in Ubuntu"?
Have I misfiled this somehow?

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[Bug 299468] Re: Intel wireless (iwlagn) poor performance, bugs, crash on ThinkPad X200s

[Erno Kuusela]

I have just upgraded to the Jaunty alpha, and problems #1 and #2 still
persist.

To work around #2 I have reverted to using /etc/network/interfaces for manually 
specifying the AP address and channel.
NetworkManager has a field for specifying the BSSID for a connection, but if I 
fill that field, it is never shown as an option in the NetworkManager GUI 
dropdown under "Wireless networks".

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[Bug 299468] Re: Intel wireless (iwlagn) poor performance, bugs, crash on ThinkPad X200s

[Rocko]

Your problem #3 looks like bug #276990, which is fixed in the 2.6.27-10
kernel (in proposed rather than main).

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[Bug 299468] Re: Intel wireless (iwlagn) poor performance, bugs, crash on ThinkPad X200s

[Erno Kuusela]

** Description changed:

  Binary package hint: linux-image-2.6.27-7-generic
  
  I will add details later, as the 3 previous attempts at bug reporting
  ate my text. (Why not allow reporting by mail like Debian?)
+ 
+ 1. Serious performance problems
+ 
+ Over 11b, I get 30-80 kB/s with wget, and simultaneously pinging the gateway 
shows ~5000 ms latencies.
+ The same network (ssid) is also available over 11a (5 GHz), which should be 
preferred for performance reasons (even if 11b was working properly), but the 
11b one is always preferred by the automatic selection.
+ 
+ 2. Manual AP selection fails
+ If I use iwconfig to manually associate to the 11a AP, it's forgotten 
automatically after a couple of minutes. I now
+ have this running in an xterm:
+ # while sleep 2; do if iwconfig wlan0 | grep -q 00:0C:85:B9:86:5C; then :; 
else date; iwconfig wlan0 channel 48 ap 00:0C:85:B9:86:5C; fi; done
+ Tue Nov 18 17:02:15 EET 2008
+ Tue Nov 18 17:04:16 EET 2008
+ Tue Nov 18 17:06:17 EET 2008
+ 
+ 3. I had warnings with stack traces in dmesg, and a crash - dead X, blinking 
caps lock light. Those may have stopped
+ after I installed linux-backports-modules-2.6.27-7-generic a few minutes ago.

** Description changed:

  Binary package hint: linux-image-2.6.27-7-generic
  
- I will add details later, as the 3 previous attempts at bug reporting
- ate my text. (Why not allow reporting by mail like Debian?)
+ (The 3 previous attempts at bug reporting ate my text. Why not allow
+ reporting by mail like Debian?)
  
  1. Serious performance problems
  
  Over 11b, I get 30-80 kB/s with wget, and simultaneously pinging the gateway 
shows ~5000 ms latencies.
  The same network (ssid) is also available over 11a (5 GHz), which should be 
preferred for performance reasons (even if 11b was working properly), but the 
11b one is always preferred by the automatic selection.
  
  2. Manual AP selection fails
  If I use iwconfig to manually associate to the 11a AP, it's forgotten 
automatically after a couple of minutes. I now
  have this running in an xterm:
  # while sleep 2; do if iwconfig wlan0 | grep -q 00:0C:85:B9:86:5C; then :; 
else date; iwconfig wlan0 channel 48 ap 00:0C:85:B9:86:5C; fi; done
  Tue Nov 18 17:02:15 EET 2008
  Tue Nov 18 17:04:16 EET 2008
  Tue Nov 18 17:06:17 EET 2008
  
  3. I had warnings with stack traces in dmesg, and a crash - dead X, blinking 
caps lock light. Those may have stopped
  after I installed linux-backports-modules-2.6.27-7-generic a few minutes ago.

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