After upgrading from lucid to maverick I started having similar problems with a 5300 card. First the transfer speeds start dropping drastically and after a while (couple of minutes) the card stops moving any data at all.
Currently running with: linux-image-2.6.35-22-generic 2.6.35-22.3. The dmesg is flooded with messages like: iwlagn 0000:03:00.0: BA scd_flow 0 does not match txq_id 10 This is probably an upstream bug, as reported in these bugzillas: https://bugzilla.kernel.org/show_bug.cgi?id=16691 http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=2214 The fix seems to require updated ucode from Intel, which they haven't released yet. The workaround is to disable .11n functionality, by giving to the iwlagn module the parameter "11n_disable=1". Also, rmmod + modprobe even without the 11n_disable parameter seems to fix the problem for few minutes, but then it starts again. Some more information can be seen for example in: https://bugs.archlinux.org/task/20542 In launchpad, a quick look shows that these three bugs are probably clones of each other: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/646711 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/630748 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/604175 And maybe even these. Some of them are from older kernels, but there seems to be reports that this ucode bug started manifesting itself around kernel 2.6.31, but mostly since 2.6.35: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/634876 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/630714 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/602649 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/594889 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/583210 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/568756 ** Bug watch added: Linux Kernel Bug Tracker #16691 http://bugzilla.kernel.org/show_bug.cgi?id=16691 ** Bug watch added: bugzilla.intellinuxwireless.org/ #2214 http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=2214 -- iwlagn degrades quickly during normal wifi session https://bugs.launchpad.net/bugs/630748 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs