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 (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. 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. How to reproduce: Run "iwconfig eth0 essid <essid>", wait ~5 secs and run "iwconfig" again. Result: it's unassociated. Expected: to show the MAC of the AP, etc. $ uname -a Linux s12 2.6.32-fw2 #1 SMP PREEMPT Sat Dec 19 13:56:14 CET 2009 x86_64 GNU/Linux $ sudo lspci -vvn|grep 43 -A7 00:00.4 0600: 1106:4353 Subsystem: 17aa:3889 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes 00:00.5 0800: 1106:5353 (prog-if 20 [IO(X)-APIC]) Subsystem: 17aa:388a -- 02:00.0 0280: 14e4:4315 (rev 01) Subsystem: 14e4:04b5 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 28 Region 0: Memory at f5200000 (64-bit, non-prefetchable) [size=16K] Capabilities:  Power Management version 3 -- Kernel driver in use: b43-pci-bridge Kernel modules: ssb dmesg: http://frugalware.org/~vmiklos/files/dmesg-s12 Wlan configuration, authentication/encryption type: b43 from vanilla kernel, no encryption. Firmware is installed as described at http://linuxwireless.org/en/users/Drivers/b43#fw-b43-lp kernel is a distro-packaged vanilla 22.214.171.124. Any ideas? Thanks!
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