I'm not sure that this is a b43 thing, but hopefully, even if it isn't, someone here will be able to point me in the right direction.
My 4318 (details below) has been working fine for quite some time with b43. As recently as 2.6.31, it was still working: Oct 18 20:30:06 localhost wpa_supplicant[2892]: CTRL-EVENT-SCAN-RESULTS Oct 18 20:30:06 localhost wpa_supplicant[2892]: Trying to associate with 00:14:d1:3e:ff:30 (SSID='cranford' freq=2437 MHz) Oct 18 20:30:06 localhost wpa_supplicant[2892]: Association request to the driver failed Oct 18 20:30:07 localhost kernel: [ 78.196304] wlan0: authenticate with AP 00:14:d1:3e:ff:30 Oct 18 20:30:07 localhost kernel: [ 78.197716] wlan0: authenticated Oct 18 20:30:07 localhost kernel: [ 78.197719] wlan0: associate with AP 00:14:d1:3e:ff:30 Oct 18 20:30:07 localhost kernel: [ 78.200084] wlan0: RX AssocResp from 00:14:d1:3e:ff:30 (capab=0x431 status=43 aid=0) Oct 18 20:30:07 localhost kernel: [ 78.200088] wlan0: AP denied association (code=43) Oct 18 20:30:07 localhost kernel: [ 78.397059] wlan0: associate with AP 00:14:d1:3e:ff:30 Oct 18 20:30:07 localhost wpa_supplicant[2892]: Associated with 00:14:d1:3e:ff:30 Oct 18 20:30:07 localhost kernel: [ 78.399232] wlan0: RX AssocResp from 00:14:d1:3e:ff:30 (capab=0x431 status=0 aid=2) Oct 18 20:30:07 localhost kernel: [ 78.399237] wlan0: associated Oct 18 20:30:07 localhost kernel: [ 78.400055] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready Oct 18 20:30:08 localhost dnsmasq[1968]: reading /var/run/dnsmasq/resolv.conf Oct 18 20:30:08 localhost dnsmasq[1968]: using nameserver 192.168.0.1#53 Oct 18 20:30:09 localhost wpa_supplicant[2892]: WPA: Key negotiation completed with 00:14:d1:3e:ff:30 [PTK=CCMP GTK=CCMP] Oct 18 20:30:09 localhost wpa_supplicant[2892]: CTRL-EVENT-CONNECTED - Connection to 00:14:d1:3e:ff:30 completed (auth) [id=0 id_str=] Oct 18 20:30:09 localhost kernel: [ 80.263676] b43-phy0 debug: Using hardware based encryption for keyidx: 0, mac: 00:14:d1:3e:ff:30 Oct 18 20:30:09 localhost kernel: [ 80.263699] b43-phy0 debug: Using hardware based encryption for keyidx: 1, mac: ff:ff:ff:ff:ff:ff The early 2.6.32 rc kernels were giving oopses, apparently because of this: https://lists.berlios.de/pipermail/bcm43xx-dev/2009-October/006129.html The patch is apparently in -rc5, but that kernel, while it doesn't oops, fails to authenticate: Oct 17 19:44:05 localhost wpa_supplicant[3477]: CTRL-EVENT-SCAN-RESULTS Oct 17 19:44:07 localhost wpa_supplicant[3477]: CTRL-EVENT-SCAN-RESULTS Oct 17 19:44:07 localhost wpa_supplicant[3477]: Trying to associate with 00:14:d1:3e:ff:30 (SSID='cranford' freq=2437 MHz) Oct 17 19:44:07 localhost kernel: [ 198.914180] wlan0: deauthenticating from 00:14:d1:3e:ff:30 by local choice (reason=3) Oct 17 19:44:07 localhost kernel: [ 198.914320] wlan0: direct probe to AP 00:14:d1:3e:ff:30 (try 1) Oct 17 19:44:07 localhost kernel: [ 198.917136] wlan0: direct probe responded Oct 17 19:44:07 localhost kernel: [ 198.917141] wlan0: authenticate with AP 00:14:d1:3e:ff:30 (try 1) Oct 17 19:44:07 localhost kernel: [ 198.918857] wlan0: authenticated Oct 17 19:44:07 localhost kernel: [ 198.918873] wlan0: associate with AP 00:14:d1:3e:ff:30 (try 1) Oct 17 19:44:07 localhost kernel: [ 198.921192] wlan0: RX AssocResp from 00:14:d1:3e:ff:30 (capab=0x431 status=43 aid=0) Oct 17 19:44:07 localhost kernel: [ 198.921196] wlan0: AP denied association (code=43) Oct 17 19:44:17 localhost wpa_supplicant[3477]: Authentication with 00:14:d1:3e:ff:30 timed out. Oct 17 19:44:19 localhost wpa_supplicant[3477]: CTRL-EVENT-SCAN-RESULTS Oct 17 19:44:19 localhost wpa_supplicant[3477]: Trying to associate with 00:14:d1:3e:ff:30 (SSID='cranford' freq=2437 MHz) Oct 17 19:44:19 localhost wpa_supplicant[3477]: Association request to the driver failed Oct 17 19:44:24 localhost wpa_supplicant[3477]: Authentication with 00:14:d1:3e:ff:30 timed out. Oct 17 19:44:25 localhost wpa_supplicant[3477]: CTRL-EVENT-SCAN-RESULTS Oct 17 19:44:25 localhost wpa_supplicant[3477]: Trying to associate with 00:14:d1:3e:ff:30 (SSID='cranford' freq=2437 MHz) Oct 17 19:44:25 localhost wpa_supplicant[3477]: Association request to the driver failed Oct 17 19:44:30 localhost wpa_supplicant[3477]: Authentication with 00:14:d1:3e:ff:30 timed out. Oct 17 19:44:31 localhost wpa_supplicant[3477]: CTRL-EVENT-SCAN-RESULTS Oct 17 19:44:31 localhost wpa_supplicant[3477]: Trying to associate with 00:14:d1:3e:ff:30 (SSID='cranford' freq=2437 MHz) Oct 17 19:44:31 localhost wpa_supplicant[3477]: Association request to the driver failed Any idea what's going on here? >From lspci vv: 06:02.0 Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02) Subsystem: AMBIT Microsystem Corp. TravelMate 2410 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: 64 Interrupt: pin A routed to IRQ 22 Region 0: Memory at d0002000 (32-bit, non-prefetchable) [size=8K] Kernel driver in use: b43-pci-bridge Running Debian Sid, kernels are my fairly aggressively stripped down configurations. The AP is set to WPA2-PSK / AES. 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