Broadcom wireless - poor scanning problem - odd?

[anandamide]

OK, so I have two wireless interfaces. The Gutsy upgrade borked my internal card (Broadcom b43 - wlan0) and after much faffing around I gave in and got a USB stick which works fine.

However, I'm now wanting to use my internal card - partly because I don't like having something useless in my desktop, and partly because I'd like to learn a bit more about linux and wireless / networking and this is a good place to start.

I have installed the b43 proprietary driver. This apparently installed without hiccup, although I noted a sticky thread giving a solution to a meerkat problem and also implemented that - no change.

All any scan brings up is a single access point (not mine). I live in a tower block in central London, a place swarming with wifi. Wlan1 picks up 6 no problem (including, fortunately, my own).

What could be going wrong here?

Here's the nitty gritty (note: I set iwconfig to ESSID:"MyNetName" while trying to sort this yesterday. hence the association!):

lspci:
Network controller: Broadcom Corporation BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller (rev 02)

iwconfig:
wlan0     IEEE 802.11bg  ESSID:"MyNetName"  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off

lsmod |grep b43:
b43                   187931  0 
mac80211              266657  3 b43,rt2x00usb,rt2x00lib
cfg80211              170293  3 b43,rt2x00lib,mac80211
led_class               3393  2 b43,rt2x00lib
ssb                    46169  1 b43

[    1.349515] b43-pci-bridge 0000:05:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[   12.768119] b43-phy2: Broadcom 4318 WLAN found (core revision 9)
[   13.013388] Registered led device: b43-phy2::tx
[   13.013408] Registered led device: b43-phy2::rx
[   13.013425] Registered led device: b43-phy2::assoc
[   13.013441] Registered led device: b43-phy2::radio
[   13.841360] b43-phy2: Loading firmware version 410.2160 (2007-05-26 15:32:10)

lshw -C network:
  *-network:1
       description: Wireless interface
       physical id: 2
       logical name: wlan0
       serial: 00:1d:60:eb:97:c8
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=b43 driverversion=2.6.35-22-generic firmware=N/A link=no multicast=yes wireless=IEEE 802.11bg


iwlist scan:
wlan0     No scan results

lsb_release -d:
Ubuntu 10.10

uname -mr:
2.6.35-22-generic x86_64

I've only included info for wlan0 as wlan1 is working fine. If info on both devices would be useful, just ask.

I'd rather get this sorted with the drivers as-is and not resort to ndiswrapper. The fact one access point is detected makes me think this could be fixed (am I being naive?).

Any help greatly appreciated. This isn't super-urgent but I would like to get it fixed and not sure where to start.

Cheers

[anandamide]

Bump

[klemes]

Can't make many recomendations on this except maybe that this could be a hardware failure related problem.We should also consider this case.
An other thing is that I would definately try the Broadcom STA driver as I think it's suited better in noisy environments.