[ipw3945] Lenovo C200 laptop wireless problem

On Thu, Jul 19, 2007 at 09:06:52PM -0000, Alex Shtof wrote:
> If you have several wireless routers available you can see that you
> cannot connect to any of them and it will always fall back to the wired
> connection.
>

What chipset/driver are you using on that laptop?

 - Alexander

Chipset: Intel Pro/Wireless 3945.
Driver: "Intel(R) PRO/Wireless 3945 Network Connection driver for Linux". This is what I see in the restricted drivers window. And of course it is enabled.

does manually using the kill switch help?

Yeah, it does.
Using the kill-switch, and then selecting a network immediately after disabling the kill switch (turning the wireless on) allows me to connect to a wireless network of my choice.

this is a driver bug. It 1. forgets about the "do not auto-associate" module configuration once you set the essid to ANY and 2. even doesn't really associate to a new essid if you are already associated; 3. it doesn't send association events to user-space when you set essid to an essid its currently associated with.

Evaluation:
network manager starts and explicitly unsets any essid to ANY/OFF in order to reset wifi state in preparation of a connection attempt. Because of 1. the driver reassociates immediately (and you see the LED on), *before* network-manager can start wpasupplicant. However, because of 3. wpa supplicant never retrieves an association ack from the driver and in turn network-manager never gets this event either (as it relies on wpa for these kind of events). So network-manager doesn't even try to obtain an IP because there is no hint that the wifi interface is ready for that operation.

Fix:
the fixed ipw3945 module source for gutsy is available from: https://code.launchpad.net/~asac/intellinuxwireless/ipw3945.asac

If you can test it, please confirm that this fixes the issue for you.

Thanks,

 - Alexander

The 18 month support period for Gutsy Gibbon 7.10 has reached its end of life -
http://www.ubuntu.com/news/ubuntu-7.10-eol . As a result, we are closing the
linux-ubuntu-modules-2.6.22 task. It would be helpful if you could test the
new Jaunty Jackalope 9.04 release and confirm if this issue remains -
http://www.ubuntu.com/getubuntu/releasenotes/904overview. If the issue still exists with the Jaunty
release, please update this report by changing the Status of the "linux (Ubuntu)"
task from "Incomplete" to "New". Thanks in advance.

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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