I have Alpha AWUS036H wireless card. I use Karmic Koala 9.10. The problem is that card stops working properly in a minute or so (can't surfe for example). I seem to be connected but I can't surf. It must be a driver problem. The connection strength is good, and much less powerful cards work fine with my wireless router.

https://bugs.launchpad.net/ubuntu/+s...ux/+bug/455354