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No scan results anymore with Broadcom BCM4312

Hello all

I have been having some problems with my wireless network card.
So far I haven't been able to figure out what causes the problem, but the device has been unable to find any network. This suddenly happened some time ago while I was using the wifi. Before then I had always used my wireless card successfully.

My network card is a:

Code:

30:00.0 Network controller: Broadcom Corporation BCM4312 802.11a/b/g (rev 01)

I am using the b43 kernel driver with the latest firmware from linuxwireless.org

I've just changed the encryption to wpa from wep, hoping that something would change.

A windows computer beside mine finds two networks: my home one (the one I am trying to connect to), and my neighbour's.

Here is some information (commands, output):

This is after the boot.

Code:

# dmesg | grep b43

b43-phy0: Broadcom 4311 WLAN found

b43-phy0 debug: Found PHY: Analog 4, Type 2, Revision 8

b43-phy0 debug: Found Radio: Manuf 0x17F, Version 0x2050, Revision 2

Code:

# ifconfig wlan0 up

b43-phy0: Loading firmware version 410.2160 (2007-05-26 15:32:10)

b43-phy0 debug: Chip initialized

b43-phy0 debug: 32-bit DMA initialized

Registered led device: b43-phy0::tx

Registered led device: b43-phy0::rx

b43-phy0 debug: Wireless interface started

b43-phy0 debug: Adding Interface type 2

ADDRCONF(NETDEV_UP): wlan0: link is not ready

Code:

# iwlist wlan0 scan

wlan0        No scan results

Code:

# ifup -v wlan0

Configuring interface wlan0=wlan0 (inet)

run-parts --verbose /etc/network/if-pre-up.d

run-parts: executing /etc/network/if-pre-up.d/wireless-tools

run-parts: executing /etc/network/if-pre-up.d/wpasupplicant

wpa_supplicant: wpa-driver wext

wpa_supplicant: /sbin/wpa_supplicant -B -P /var/run/wpa_supplicant.wlan0.pid -i wlan0 -D wext -q -f /var/log/wpa_supplicant.wlan0.log -C /var/run/wpa_supplicant

Starting /sbin/wpa_supplicant...

wpa_supplicant: creating sendsigs omission pidfile: /lib/init/rw/sendsigs.omit.d/wpasupplicant.wpa_supplicant.wlan0.pid

wpa_supplicant: ctrl_interface socket located at /var/run/wpa_supplicant/wlan0

wpa_supplicant: wpa-ap-scan 1 -- OK

wpa_supplicant: configuring network block -- 0

wpa_supplicant: wpa-ssid "XXX" -- OK

wpa_supplicant: wpa-psk ***** -- OK

wpa_supplicant: wpa-pairwise TKIP -- OK

wpa_supplicant: wpa-group TKIP -- OK

wpa_supplicant: wpa-key-mgmt WPA-PSK -- OK

wpa_supplicant: wpa-proto WPA -- OK

wpa_supplicant: enabling network block 0 -- OK



dhclient3 -pf /var/run/dhclient.wlan0.pid -lf /var/lib/dhcp3/dhclient.wlan0.leases wlan0

Internet Systems Consortium DHCP Client V3.1.1

Copyright 2004-2008 Internet Systems Consortium.

All rights reserved.

For info, please visit http://www.isc.org/sw/dhcp/



wmaster0: unknown hardware address type 801

wmaster0: unknown hardware address type 801

Listening on LPF/wlan0/YYY

Sending on   LPF/wlan0/YYY

Sending on   Socket/fallback

DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8

DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 19

DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 11

DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 14

DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9

No DHCPOFFERS received.

No working leases in persistent database - sleeping.

run-parts --verbose /etc/network/if-up.d

run-parts: executing /etc/network/if-up.d/000resolvconf

run-parts: executing /etc/network/if-up.d/avahi-daemon

run-parts: executing /etc/network/if-up.d/mountnfs

if-up.d/mountnfs[wlan0]: waiting for interface lo before doing NFS mounts (warning).

run-parts: executing /etc/network/if-up.d/openvpn

run-parts: executing /etc/network/if-up.d/wpasupplicant

My wlan0 interface configuration in /etc/network/interfaces

Code:

iface wlan0 inet dhcp

  wpa-driver wext

  wpa-ssid XXX

  wpa-ap-scan 1

  wpa-proto WPA

  wpa-pairwise TKIP

  wpa-group TKIP

  wpa-key-mgmt WPA-PSK

  wpa-psk ZZZ

  wireless-channel 6

I am using a customized 2.6.25-4 kernel, on an x86_64 Debian testing machine.

I've asked for help elsewhere but all I learned is that the driver seems to work fine.

Thank you

From looking at your listings, it appears that you are not getting an ip address, therefore you aren't on the network. I would look at this before anything else. Your configuration looks good, and the card initializes which means the driver and firmware are both good. But notice after issuing the ifup command, you didn't receive an ip address from your dhcp server and the card went to sleep. That's where I believe your problem is.

hth

Thanks for the reply.

I see what you mean. However, how can I get an IP address from DHCP, when my driver sees _no_ networks, and is not associated with any access point?

If I remember well, what normally happens is:
1. device is up, driver is loaded
2. finds n networks after scan
3. connects to one of the n networks

I am missing point 2, which I believe is necessary to connect.
Is that right?

How did you got the b43 driver to work with Broadcom BCM4312?

I had a real hard time getting my broadcom card to work. In my case, the problem was the broadcom firmware. Using fwcutter didn't work because the firmware server that hosts the fwcutter firmware downloads has been down. I found this site and followed his instructions, and my wireless installed perfectly. Here is the link:

http://www.debiantutorials.org/content/view/153/213/

Make sure you read the whole thing through before you start as he has addendums throughout.

HTH

I actually haven't had any problems getting it to work in the first place. It happened that it stopped working, and since then there has been nothing that fixed it.

I use the fwcutter from the debian repositories, it seems to get the firmware itself and install it. The link you posted explains pretty much what I do.

I am beginning to think that the device has a hardware problem, since it cannot see _any_ network around (and I know for sure there are).

Thanks for your help anyway!

I apologize that I missed the point about it working in the first place. It is possible that the card could be bad. In my experience, when a NIC stops working, it's usually not hardware. That's not to say that it isn't bad, just my past experience.

Have you tried a program such as wifi-radar? On my Debian Etch laptop, the network manager wouldn't see the networks, but wifi-radar saw them and allowed me to connect to them. Also, the built-in network manager wouldn't allow me to set up anything other than WEP for security. I am using WPA, so I had to modify my interfaces conf file for my home network, and then used wifi-radar when I was away from the house. Just a thought.

I tried wifi-radar now. I am not sure whether it should scan for networks and show them in a list or not, but the list was empty. I added a new configuration with "New" and then tried to connect, but it didn't work.

I am using WEP and I have a MAC address filter.

Not sure what to do next.. :confused:

I would remove WEP and MAC filtering and try to get the wireless working first, then enable those features. That way, you eliminate other issue that could be causing it.

Wifi-Radar should show you a list of available networks shortly after starting. If you don't see any, then clearly the card isn't seeing them. I am out of ideas as everything shows it should be working. Hopefully someone else can chime in and let us know what we're missing.