Interesting! Miklos Vajna wrote: > Hi, > > I tried asking on #bcm-users, then found the wiki where it's suggested > to report to this list, so I'm doing so. Sorry for the noise on IRC. > > A description of the problem at hand: > > My card works fine when I use it with WPA, however when I try to use it > without any encryption
Do you have wpa_supplicant running also when not using encryption? > (actually the provider uses MAC-based filtering, but that's not > important), then after the "iwconfig eth0 essid <essid>", > "iwconfig" shows the MAC of the AP, and after about 5 secs "iwconfig" > says it's "Not-Associated". If I run iwconfig eth0 essid again, then > it's usable again for ~5 secs and so on. When the AP goes unassociated, > I see this in dmesg: > > No probe response from AP 00:12:17:d3:87:f5 after 500ms, disconnecting. I also get this issue, but with ath9k. I have made some noise on the ath9k list about it, and currently have a reboot pending to try the latest wireless-testing, which has gotten some more fixes. > When it happens: > > It happens only in case not using encryption. An other laptop with > ipw2200 driver works fine, so I guess this will be a b43 or firmware > problem. The same card works under Windows XP as well, so I guess > it's not a hardware problem. I upgraded from ipw2200 to ath9k in my laptop and the old card never had trouble. Both ath9k and b43 use mac80211 but ipw2200 does not. With mac80211 you're apparently supposed to always have wpa_supplicant running - even if not using encryption. The supplicant is responsible for reconnecting if the interface is disconnected for any reason. I'm not satisfied with this as the final answer yet. I find it suspicious that my card disconnects in the first place. I am normally in a moderately silent RF environment, with not many APs. With power management enabled (iwconfig eth1 power on) I experience this issue within minutes. With PM disabled, it happens only every couple of days. This is on wireless-testing as of Dec 14. In a very tough RF environment such as a hacker conference the problem is much more pronounced and disconnects happen many times per day also with PM off. > Any ideas? Does iwconfig power off make a difference for you? //Peter
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