Bug 15892 - Intel WiFi Link 5150ABG can't connect to Access Point if "802.11N-Only Mode" enabled
Summary: Intel WiFi Link 5150ABG can't connect to Access Point if "802.11N-Only Mode" ...
Status: CLOSED INVALID
Alias: None
Product: Networking
Classification: Unclassified
Component: Wireless (show other bugs)
Hardware: All Linux
: P1 high
Assignee: networking_wireless@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-05-01 13:01 UTC by RussianNeuroMancer
Modified: 2010-05-26 19:17 UTC (History)
3 users (show)

See Also:
Kernel Version: 2.6.34rc5
Subsystem:
Regression: Yes
Bisected commit-id:


Attachments
Syslog (created with 2.6.34 kernel) (135.10 KB, text/plain)
2010-05-24 12:39 UTC, RussianNeuroMancer
Details
results of "lspci -nnv" for verification (13.07 KB, application/octet-stream)
2010-05-24 23:17 UTC, RussianNeuroMancer
Details

Description RussianNeuroMancer 2010-05-01 13:01:10 UTC
I install 2.6.34rc5 kernel for test another issue https://bugzilla.kernel.org/show_bug.cgi?id=15891 with fresh driver, but found another problem. If in Access Point settings "802.11N-Only Mode" enabled Intel WiFi Link 5150ABN can't connect to AP.
If I change mode to "Mixed" or "802.11G-Only Mode" Intel WiFi Link 5150ABN can connect to AP.

What additional information would need to provide?
Comment 1 Shanyu Zhao 2010-05-03 21:58:58 UTC
Hi,

Can you please compile the driver with debug options:
CONFIG_IWLWIFI_DEBUG=y 
CONFIG_IWLWIFI_DEBUGFS=y 

And load the module with parameter "debug=0x43fff", like this:
$modprobe -r iwlagn
$modprobe iwlagn debug=0x43fff

Then send us the complete debug log?

Btw, what AP were you using?

Thanks,
Shanyu

Thanks,
Shanyu
Comment 2 RussianNeuroMancer 2010-05-04 01:17:06 UTC
> Can you please compile the driver with debug options:
How do this?
Comment 3 Shanyu Zhao 2010-05-04 21:05:58 UTC
Hi Can you please confirm the card you're using? Is it "WiFi Link 5150ABN" or "WiFi Link 5150ABG"? If it is the latter then it won't connect to AP with 11N-Only mode.

From the source code I can tell there're only two 5150 cards supported: AGN or ABG.

Thanks,
Shanyu
Comment 4 RussianNeuroMancer 2010-05-13 02:18:58 UTC
$ dmesg | grep WiFi
[13.927910] iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, 1.3.27k
[13.928021] iwlagn 0000:04:00.0: Detected Intel Wireless WiFi Link 5150AGN REV=0x44

Sorry, I mistake, it's AGN card.
Comment 5 Shanyu Zhao 2010-05-18 20:44:30 UTC
Hi,

Do you still see the problem? Instead of just sending the two lines above, can you send the complete syslog when it failed to connect to your AP (set to 11n mode)?

Btw, is it possible for you to disclose what AP are you using?

Thanks,
Shanyu
Comment 6 RussianNeuroMancer 2010-05-24 12:39:08 UTC
Created attachment 26520 [details]
Syslog (created with 2.6.34 kernel)

I using Linksys WRT610Nv2 AP, and also tried Linksys WRT320Nv1.

I find something strang. This two lines above I gather with 2.6.32 kernel, and you see - adapter detected like AGN. But if you open syslog, you find another result: 2.6.34 detect adapter like ABG. Maybe my issue result of incorrect detection of adapter?
Comment 7 Shanyu Zhao 2010-05-24 19:03:56 UTC
OK, most likely your NIC cards is actually a ABG instead of an AGN. Can you please send us the results of "lspci -nnv" for verification?

The 2.6.32 kernel incorrectly detects some 5150ABG devices to be AGN. This probably needs to be fixed.

This would likely to explain the other kernel bug as well:
https://bugzilla.kernel.org/show_bug.cgi?id=15891 

Thanks,
Shanyu
Comment 8 RussianNeuroMancer 2010-05-24 23:17:08 UTC
Created attachment 26534 [details]
results of "lspci -nnv" for verification
Comment 9 Shanyu Zhao 2010-05-26 19:14:40 UTC
Unfortunately your device is indeed an ABG device. So the 2.6.34 kernel correctly recognized the device and the behavior described in this bug is actually an expected behavior. This bug should be closed.

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