When I try to set the essid while the card is up nothing happens. No error. Simply the essid is not set, according to iwconfig. After a few weeks using the laptop with feisty, I also noticed that sometimes the essid cannot be set even if the card is down. As I usually notice that only when I "up" the card after setting essid, I don't know what iwconfig would report between the moment I try to set essid and the moment I "up" the card. Anyway, when that happens I just repeat the down/set essid/up process and it works.
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