Have you tried the "backport" modules? In the past, the backported rt2x00 modules worked better for my USB dongle, thought I haven't tested it on Karmic.
$ sudo apt-get install linux-backports-modules-karmic-generic
(A restart is required for the new modules to load properly).
Have you tried the "backport" modules? In the past, the backported rt2x00 modules worked better for my USB dongle, thought I haven't tested it on Karmic.
$ sudo apt-get install linux-backports -modules- karmic- generic
(A restart is required for the new modules to load properly).