[arch-general] wireless driver broadcom b43 random success or failure

[message]

Readers,

Can anyone explain if the following 'dmesg' outputs are useful to 
understand why after start of X session, the wireless driver fails 
sometimes? The wireless driver does not start automatically and is 
always started manually with the command (as root):

modprobe b43

Below is the dmesg output when the command above, starts successfully 
the wireless driver:

b44: Broadcom 44xx/47xx 10/100 PCI ethernet driver version 2.0
b44 ssb1:0 eth0: Broadcom 44xx/47xx 10/100 PCI ethernet driver ...
IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
b43-phy0: Broadcom 4311 WLAN found (core revision 10)
b43-phy0: Found PHY: Analog 4, Type 2 (G), Revision 8
b43-phy0: Found Radio: Manuf 0x17F, ID 0x2050, Revision 2, Version 0
Broadcom 43xx driver loaded [ Features: PNLS ]
ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
b43-phy0: Loading firmware version 666.2 (2011-02-23 01:15:07)
IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
wlan0: authenticate with ...
wlan0: send auth to ... (try 1/3)
wlan0: authenticated
wlan0: associate with ... (try 1/3)
wlan0: RX AssocResp from ... (capab=0x431 status=0 aid=1)
wlan0: associated
IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

Below when the 'modprobe b43' fails to start the wireless driver:

b43-phy0: Broadcom 4311 WLAN found (core revision 10)
b43-phy0: Found PHY: Analog 4, Type 2 (G), Revision 8
b43-phy0 ERROR: FOUND UNSUPPORTED RADIO (Manuf 0xFFF, ID 0xFFFF, 
Revision 15, Version 0)
b43: probe of ssb0:0 failed with error -95
Broadcom 43xx driver loaded [ Features: PNLS ]

The only solution seems to be to switch off the computer and start 
again, sometimes 3 or 4 times repeated failure occurs.