b43: cannot set channel to 12

b43: cannot set channel to 12

[Andreas Schwab]

The b43 driver in current wireless-2.6 cannot set the channel to 12:

# iwconfig wlan0 chan 12
Error for wireless request "Set Frequency" (8B04) :
    SET failed on device wlan0 ; Invalid argument

iwlist still lists the APs on channels 12 and 13.

This is a 4318 in a iBook G4, using firmware version 410.2160.

Andreas.

--=20
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstra=DFe 5, 90409 N=FCrnberg, Germany
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Re: b43: cannot set channel to 12

[Larry Finger]

Andreas Schwab wrote:
> The b43 driver in current wireless-2.6 cannot set the channel to 12:
> 
> # iwconfig wlan0 chan 12
> Error for wireless request "Set Frequency" (8B04) :
>     SET failed on device wlan0 ; Invalid argument
> 
> iwlist still lists the APs on channels 12 and 13.
> 
> This is a 4318 in a iBook G4, using firmware version 410.2160.

This is not a b43 problem. The standard loading of mac80211 sets an FCC regulatory domain, i.e. b/g
channels 1-11. You need to load mac80211 with a parameter of 'ieee80211_regdom=64'. That will allow
b/g channels 1-13. Technically, it sets the regulatory domain to Japan, but channel 14 is not allowed.

Larry

Re: b43: cannot set channel to 12

[Andreas Schwab]

Larry Finger <larry.finger@lwfinger.net> writes:

> This is not a b43 problem. The standard loading of mac80211 sets an F=
CC regulatory domain, i.e. b/g
> channels 1-11. You need to load mac80211 with a parameter of 'ieee802=
11_regdom=3D64'. That will allow
> b/g channels 1-13. Technically, it sets the regulatory domain to Japa=
n, but channel 14 is not allowed.

Thanks, that works.  (But I regard it as a regression.)

Andreas.

--=20
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstra=DFe 5, 90409 N=FCrnberg, Germany
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ED5
"And now for something completely different."
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Re: b43: cannot set channel to 12

[Larry Finger]

Andreas Schwab wrote:
> Larry Finger <larry.finger@lwfinger.net> writes:
> 
>> This is not a b43 problem. The standard loading of mac80211 sets an FCC regulatory domain, i.e. b/g
>> channels 1-11. You need to load mac80211 with a parameter of 'ieee80211_regdom=64'. That will allow
>> b/g channels 1-13. Technically, it sets the regulatory domain to Japan, but channel 14 is not allowed.
> 
> Thanks, that works.  (But I regard it as a regression.)

That is in the eye of the beholder. For those of us in FCC-land, the default behavior of bcm43xx
(channels 1-14) was a bug _AND_ a violation of regulations and law.

Handling regulatory domain information including allowed channels, power, etc. is still a big
weakness of all MAC layers, both hard and soft.

Larry

Re: b43: cannot set channel to 12

[Michael Buesch]

On Wednesday 17 October 2007 21:37:31 Andreas Schwab wrote:
> The b43 driver in current wireless-2.6 cannot set the channel to 12:
> 
> # iwconfig wlan0 chan 12
> Error for wireless request "Set Frequency" (8B04) :
>     SET failed on device wlan0 ; Invalid argument
> 
> iwlist still lists the APs on channels 12 and 13.
> 
> This is a 4318 in a iBook G4, using firmware version 410.2160.

That seems to be a mac80211 regulatory problem, not a b43 bug.

-- 
Greetings Michael.