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 looks at stats for speed, range, etc. calculation, but that's hardly something that would affect speed. Then there's the obvious background scanning, but this isn't causing any issue on other cards.
As a test, could you please try to run Precise with the latest NetworkManager from the NetworkManager trunk ppa (http://launchpad.net /~network-manager/+archive/trunk). There's been some changes to the wifi code in git, so it's worth verifying. As for another test; please try to run just wpasupplicant from Oneiric on Natty, and see if this causes the connection to not get the expected performance. >From there, we'll need full syslog of what happens while testing the >connection performance, preferably with NetworkManager in debug: you can get >this easily after starting NetworkManager but using the debug helper script >here: http://cgit.freedesktop.org/NetworkManager/NetworkManager/plain/test/debug-helper.py Call it as "debug-helper.py --nm debug"; we want to get all the debugging information available. If nothing helps, packet captures when experiencing the problem would certainly shed more light on what's happening. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/836250 Title: [Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor networking, packet loss and very slow Lenovo X201 and T500 laptops To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/836250/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
