Comment 61 for bug 518196

@dave945:

I'm not real sure what the best way forward is now. You can try various combinations of firmware and drivers to see if any work, and if you find anything be sure to let us know. The latest compat-wireless tree may include some fixes that affect you. Some newer drivers can be found in the linux-backports-modules package available in the karmic pre-proposed ppa: https://launchpad.net/~kernel-ppa/+archive/pre-proposed/.

However, your issues are a little beyond my experience. I suggest going through the documentation at http://linuxwireless.org/en/users/Documentation/Reporting_bugs to check some more variables and then report a bug to the linux-wireless mailing list. If you do report a bug to the mailing list, please include a link to your message in a comment here.