[gentoo-user] Where's my wireless AP?

[gentoo-user] Where's my wireless AP?

[Mick]

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Last night I was connected wirelessly to my access point and all worked fine. 
Well, towards the end the connection was bobbing up and down as far as my 
unreliable broadcom NIC is concerned (nothing wrong with the router).  I 
decided to shut it down and go to bed.

Today the AP is just not there!  Not there as far as this stupid broadcom 
wireless NIC is concerned.  The same machine booted into MSWindows has no 
problem seeing the AP and associating with it.  Another laptop can also see 
the AP and connect to it.

How come the broadcom cannot see it in Gentoo, but it can see all the 
neighbours APs which have a much weaker signal and even associate and get an 
IP address from one of them?!  I am lost as to what might be causing this.

Could it be some lock file that was not removed when the machine is rebooted 
or the wlan0 interface taken down?  Any ideas how I can troubleshoot this?
-- 
Regards,
Mick

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[gentoo-user] Re: Where's my wireless AP?

[Mick]

On 18 April 2010 22:28, Mick <michaelkintzios@gmail.com> wrote:
> Last night I was connected wirelessly to my access point and all worked fine.
> Well, towards the end the connection was bobbing up and down as far as my
> unreliable broadcom NIC is concerned (nothing wrong with the router).  I
> decided to shut it down and go to bed.
>
> Today the AP is just not there!  Not there as far as this stupid broadcom
> wireless NIC is concerned.  The same machine booted into MSWindows has no
> problem seeing the AP and associating with it.  Another laptop can also see
> the AP and connect to it.
>
> How come the broadcom cannot see it in Gentoo, but it can see all the
> neighbours APs which have a much weaker signal and even associate and get an
> IP address from one of them?!  I am lost as to what might be causing this.
>
> Could it be some lock file that was not removed when the machine is rebooted
> or the wlan0 interface taken down?  Any ideas how I can troubleshoot this?

OK, I found what the problem was ... the AP is currently transmitting
on channel 13, which it seems is outside the capabilities of the b43
driver.  I am blaming the driver here because the Windows 7 OS has no
problem using channel 13, while iwlist wlan0 in Gentoo shows only up
to channel 11.  :-(

Will need to wait for the driver to hopefully improve.
-- 
Regards,
Mick

Re: [gentoo-user] Re: Where's my wireless AP?

[Stroller]

On 18 Apr 2010, at 23:35, Mick wrote:
> ...
> OK, I found what the problem was ... the AP is currently transmitting
> on channel 13, which it seems is outside the capabilities of the b43
> driver.  I am blaming the driver here because the Windows 7 OS has no
> problem using channel 13, while iwlist wlan0 in Gentoo shows only up
> to channel 11.  :-(

There might be an option to change the region of your wifi NIC.  
Channels 12 & 13 are legal in Europe, IIRC, but not in the USA.

You should be able to change the channel of the AP - typically they  
have a drop-down which will choose either "auto" or a specific  
channel. Likewise I have seen some APs ask what region you're in when  
they're first setup.

Stroller.

Re: [gentoo-user] Re: Where's my wireless AP?

[Mick]

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On Monday 19 April 2010 18:26:14 Stroller wrote:
> On 18 Apr 2010, at 23:35, Mick wrote:
> > ...
> > OK, I found what the problem was ... the AP is currently transmitting
> > on channel 13, which it seems is outside the capabilities of the b43
> > driver.  I am blaming the driver here because the Windows 7 OS has no
> > problem using channel 13, while iwlist wlan0 in Gentoo shows only up
> > to channel 11.  :-(
> 
> There might be an option to change the region of your wifi NIC.
> Channels 12 & 13 are legal in Europe, IIRC, but not in the USA.
> 
> You should be able to change the channel of the AP - typically they
> have a drop-down which will choose either "auto" or a specific
> channel. Likewise I have seen some APs ask what region you're in when
> they're first setup.

I've set it up for UK so it has 13 channels.  On the other hand your hint 
pointed me to wpa_supplicant.conf on my laptop, in which I had the country 
parameter commented out.  I set that up to UK, but it still seems to show 11 
channels.  :-(

I'll reboot later to see if it makes any odds.
-- 
Regards,
Mick

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Re: [gentoo-user] Re: Where's my wireless AP?

[Mick]

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On Monday 19 April 2010 20:24:18 you wrote:
> On Monday 19 April 2010 18:26:14 Stroller wrote:
> > On 18 Apr 2010, at 23:35, Mick wrote:
> > > ...
> > > OK, I found what the problem was ... the AP is currently transmitting
> > > on channel 13, which it seems is outside the capabilities of the b43
> > > driver.  I am blaming the driver here because the Windows 7 OS has no
> > > problem using channel 13, while iwlist wlan0 in Gentoo shows only up
> > > to channel 11.  :-(
> >
> > There might be an option to change the region of your wifi NIC.
> > Channels 12 & 13 are legal in Europe, IIRC, but not in the USA.
> >
> > You should be able to change the channel of the AP - typically they
> > have a drop-down which will choose either "auto" or a specific
> > channel. Likewise I have seen some APs ask what region you're in when
> > they're first setup.
> 
> I've set it up for UK so it has 13 channels.  On the other hand your hint
> pointed me to wpa_supplicant.conf on my laptop, in which I had the country
> parameter commented out.  I set that up to UK, but it still seems to show
>  11 channels.  :-(
> 
> I'll reboot later to see if it makes any odds.

No change :-(

# iwlist wlan0 channel                    
wlan0     11 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Current Frequency:2.412 GHz (Channel 1)

Short of hacking the firmware (which even if I knew how to, I am not allowed) 
or waiting for the linux driver to mature, I am not sure if there's anything I 
can do.
-- 
Regards,
Mick

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Re: [gentoo-user] Re: Where's my wireless AP?

[Stroller]

On 19 Apr 2010, at 23:03, Mick wrote:
>>> ...
>>> There might be an option to change the region of your wifi NIC.
>>> Channels 12 & 13 are legal in Europe, IIRC, but not in the USA.
>>>
>>> You should be able to change the channel of the AP - typically they
>>> have a drop-down which will choose either "auto" or a specific
>>> channel. Likewise I have seen some APs ask what region you're in  
>>> when
>>> they're first setup.
>>
>> I've set it up for UK so it has 13 channels.  On the other hand  
>> your hint
>> pointed me to wpa_supplicant.conf on my laptop, in which I had the  
>> country
>> parameter commented out.  I set that up to UK, but it still seems  
>> to show
>> 11 channels.  :-(
>>
>> I'll reboot later to see if it makes any odds.
>
> No change :-(
>
> # iwlist wlan0 channel
> wlan0     11 channels in total; available frequencies :
>          Channel 01 : 2.412 GHz
>          Channel 02 : 2.417 GHz
>          Channel 03 : 2.422 GHz
>          Channel 04 : 2.427 GHz
>          Channel 05 : 2.432 GHz
>          Channel 06 : 2.437 GHz
>          Channel 07 : 2.442 GHz
>          Channel 08 : 2.447 GHz
>          Channel 09 : 2.452 GHz
>          Channel 10 : 2.457 GHz
>          Channel 11 : 2.462 GHz
>          Current Frequency:2.412 GHz (Channel 1)
>
> Short of hacking the firmware (which even if I knew how to, I am not  
> allowed)
> or waiting for the linux driver to mature, I am not sure if there's  
> anything I
> can do.

Can't you just change the channel the AP uses?

If you live somewhere with a high population density, then channel 13  
may be a good one to use to avoid the interference of Sky1234,  
BTHomeHub5678 and all the other "free" routers supplied by ISPs which  
will tend to default to channels 1, 6 and 11.

However, if you live somewhere with fewer neighbours channel 13 may  
not be necessary. Try a scan for nearby APs, note some sections of  
frequency that are relatively unused [1], reset your router to use  
that channel, reboot it and try it.

Stroller.



[1] Slightly difficult to encapsulate all the criteria for this in  
just a few words, so try a few different channels and write back if  
you need a longer explanation.

Re: [gentoo-user] Re: Where's my wireless AP?

[Paul Hartman]

On Mon, Apr 19, 2010 at 2:24 PM, Mick <michaelkintzios@gmail.com> wrote:
> On Monday 19 April 2010 18:26:14 Stroller wrote:
>> On 18 Apr 2010, at 23:35, Mick wrote:
>> > ...
>> > OK, I found what the problem was ... the AP is currently transmitting
>> > on channel 13, which it seems is outside the capabilities of the b43
>> > driver.  I am blaming the driver here because the Windows 7 OS has no
>> > problem using channel 13, while iwlist wlan0 in Gentoo shows only up
>> > to channel 11.  :-(
>>
>> There might be an option to change the region of your wifi NIC.
>> Channels 12 & 13 are legal in Europe, IIRC, but not in the USA.
>>
>> You should be able to change the channel of the AP - typically they
>> have a drop-down which will choose either "auto" or a specific
>> channel. Likewise I have seen some APs ask what region you're in when
>> they're first setup.
>
> I've set it up for UK so it has 13 channels.  On the other hand your hint
> pointed me to wpa_supplicant.conf on my laptop, in which I had the country
> parameter commented out.  I set that up to UK, but it still seems to show 11
> channels.  :-(
>
> I'll reboot later to see if it makes any odds.

I think the proper country code is GB not UK, maybe that's why it didn't work.

With iw try:

iw reg set GB

or in your wpa_supplicant config:

country=GB

Re: [gentoo-user] Re: Where's my wireless AP?

[Mick]

On 20 April 2010 02:27, Paul Hartman <paul.hartman+gentoo@gmail.com> wrote:

> I think the proper country code is GB not UK, maybe that's why it didn't work.
>
> With iw try:
>
> iw reg set GB
>
> or in your wpa_supplicant config:
>
> country=GB
>
>
Thanks Paul, good pointer.  It seems that the UK also has GB as well
'UK' as its alpha2 code.  Anyway, I changed 'country=GB' in my
wpa_supplicant but unfortunately it is not being picked up:

# iwlist wlan0 freq
wlan0     11 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Current Frequency:2.412 GHz (Channel 1)

then:

# iw reg set GB

# iw reg get
country US:
        (2402 - 2472 @ 40), (6, 27)
        (5170 - 5190 @ 40), (6, 23)
        (5190 - 5210 @ 40), (6, 23)
        (5210 - 5230 @ 40), (6, 23)
        (5230 - 5330 @ 40), (6, 23)
        (5735 - 5835 @ 40), (6, 30)

# iw list
Wiphy phy0
        Band 1:
                Frequencies:
                        * 2412 MHz [1] (27.0 dBm)
                        * 2417 MHz [2] (27.0 dBm)
                        * 2422 MHz [3] (27.0 dBm)
                        * 2427 MHz [4] (27.0 dBm)
                        * 2432 MHz [5] (27.0 dBm)
                        * 2437 MHz [6] (27.0 dBm)
                        * 2442 MHz [7] (27.0 dBm)
                        * 2447 MHz [8] (27.0 dBm)
                        * 2452 MHz [9] (27.0 dBm)
                        * 2457 MHz [10] (27.0 dBm)
                        * 2462 MHz [11] (27.0 dBm)
                        * 2467 MHz [12] (disabled)
                        * 2472 MHz [13] (disabled)
                        * 2484 MHz [14] (disabled)

Hmm, it's stuck in US mode for some reason.  Firmware?
-- 
Regards,
Mick

Re: [gentoo-user] Re: Where's my wireless AP?

[Paul Hartman]

On Tue, Apr 20, 2010 at 5:21 AM, Mick <michaelkintzios@gmail.com> wrote:
> Hmm, it's stuck in US mode for some reason.  Firmware?

Maybe you're right, I googled and found some info that the old
broadcom driver didn't support channels 12 and 13 for some reason with
certain hardware. However, it appears b43 is the "old" driver, and the
new one which should support those channels and setting regulatory
domain is the Broadcom STA driver, which is in portage for ~x86 and
~amd64 (net-wireless/broadcom-sta). Try to emerge it, blacklist your
old b43 driver and hope it works. :)

Here's the Broadcom STA docs: http://www.broadcom.com/docs/linux_sta/README.txt

(I don't have a broadcom card so this is all guessing, hope it helps!)

Re: [gentoo-user] Re: Where's my wireless AP?

[Mick]

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On Tuesday 20 April 2010 15:25:14 Paul Hartman wrote:
> On Tue, Apr 20, 2010 at 5:21 AM, Mick <michaelkintzios@gmail.com> wrote:
> > Hmm, it's stuck in US mode for some reason.  Firmware?
> 
> Maybe you're right, I googled and found some info that the old
> broadcom driver didn't support channels 12 and 13 for some reason with
> certain hardware. However, it appears b43 is the "old" driver, and the
> new one which should support those channels and setting regulatory
> domain is the Broadcom STA driver, which is in portage for ~x86 and
> ~amd64 (net-wireless/broadcom-sta). Try to emerge it, blacklist your
> old b43 driver and hope it works. :)

Thanks Paul.  This is confusing me ... I thought that the b43 (as opposed to 
the legacy bcm43xx) is the latest in kernel driver and that's why I chose it.  
It is probably still under development.

I am just emerging gentoo-sources-2.6.33-r1 and I'll see if the situation 
improves.  Otherwise I will have to remove it and emerge the proprietary 
drivers instead, until the b43 matures a bit more.
-- 
Regards,
Mick

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Re: [gentoo-user] Re: Where's my wireless AP?

[Mick]

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On Tuesday 20 April 2010 22:24:41 Mick wrote:
> On Tuesday 20 April 2010 15:25:14 Paul Hartman wrote:
> > On Tue, Apr 20, 2010 at 5:21 AM, Mick <michaelkintzios@gmail.com> wrote:
> > > Hmm, it's stuck in US mode for some reason.  Firmware?
> >
> > Maybe you're right, I googled and found some info that the old
> > broadcom driver didn't support channels 12 and 13 for some reason with
> > certain hardware. However, it appears b43 is the "old" driver, and the
> > new one which should support those channels and setting regulatory
> > domain is the Broadcom STA driver, which is in portage for ~x86 and
> > ~amd64 (net-wireless/broadcom-sta). Try to emerge it, blacklist your
> > old b43 driver and hope it works. :)
> 
> Thanks Paul.  This is confusing me ... I thought that the b43 (as opposed
>  to the legacy bcm43xx) is the latest in kernel driver and that's why I
>  chose it. It is probably still under development.
> 
> I am just emerging gentoo-sources-2.6.33-r1 and I'll see if the situation
> improves.  Otherwise I will have to remove it and emerge the proprietary
> drivers instead, until the b43 matures a bit more.

OK, the 2.6.33-r1 seems better so far:

# iwlist wlan0 freq
wlan0     14 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz
          Channel 14 : 2.484 GHz
          Current Frequency:2.412 GHz (Channel 1)

and 

# iw list
Wiphy phy0
        Band 1:
                Frequencies:
                        * 2412 MHz [1] (20.0 dBm)
                        * 2417 MHz [2] (20.0 dBm)
                        * 2422 MHz [3] (20.0 dBm)
                        * 2427 MHz [4] (20.0 dBm)
                        * 2432 MHz [5] (20.0 dBm)
                        * 2437 MHz [6] (20.0 dBm)
                        * 2442 MHz [7] (20.0 dBm)
                        * 2447 MHz [8] (20.0 dBm)
                        * 2452 MHz [9] (20.0 dBm)
                        * 2457 MHz [10] (20.0 dBm)
                        * 2462 MHz [11] (20.0 dBm)
                        * 2467 MHz [12] (20.0 dBm) (passive scanning, no IBSS)
                        * 2472 MHz [13] (20.0 dBm) (passive scanning, no IBSS)
                        * 2484 MHz [14] (20.0 dBm) (passive scanning, no IBSS)

# iw reg get
country 00:
        (2402 - 2472 @ 40), (6, 20)
        (2457 - 2482 @ 20), (6, 20), PASSIVE-SCAN, NO-IBSS
        (2474 - 2494 @ 20), (6, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
        (5170 - 5250 @ 40), (6, 20), PASSIVE-SCAN, NO-IBSS
        (5735 - 5835 @ 40), (6, 20), PASSIVE-SCAN, NO-IBSS

I guess country 00 means no country code?
-- 
Regards,
Mick

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Re: [gentoo-user] Re: Where's my wireless AP?

[Steffen Loos]

> # iw reg get
> country 00:
>          (2402 - 2472 @ 40), (6, 20)
>          (2457 - 2482 @ 20), (6, 20), PASSIVE-SCAN, NO-IBSS
>          (2474 - 2494 @ 20), (6, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
>          (5170 - 5250 @ 40), (6, 20), PASSIVE-SCAN, NO-IBSS
>          (5735 - 5835 @ 40), (6, 20), PASSIVE-SCAN, NO-IBSS
>
> I guess country 00 means no country code?

Just try to set up "ieee80211_regdom=EU" for module "cfg80211".

---8<---
  # modprobe -v cfg80211 ieee80211_regdom=EU
insmod /lib/modules/2.6.32-tuxonice-r5/kernel/net/wireless/cfg80211.ko ieee80211_regdom=EU

  # dmesg
cfg80211: Using static regulatory domain info
cfg80211: Regulatory domain: EU
         (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
         (2402000 KHz - 2482000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
         (5170000 KHz - 5190000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
         (5190000 KHz - 5210000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
         (5210000 KHz - 5230000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
         (5230000 KHz - 5330000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
         (5490000 KHz - 5710000 KHz @ 40000 KHz), (600 mBi, 3000 mBm)
cfg80211: Calling CRDA for country: EU
cfg80211: Calling CRDA for country: EU

  # iw reg get
country EU:
         (2402 - 2482 @ 40), (6, 20)
         (5170 - 5190 @ 40), (6, 23), PASSIVE-SCAN
         (5190 - 5210 @ 40), (6, 23), PASSIVE-SCAN
         (5210 - 5230 @ 40), (6, 23), PASSIVE-SCAN
         (5230 - 5330 @ 40), (6, 20), DFS, NO-IBSS
         (5490 - 5710 @ 40), (6, 30), DFS, NO-IBSS
--->8---

regards,
Steffen

Re: [gentoo-user] Re: Where's my wireless AP?

[Mick]

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On Wednesday 21 April 2010 15:41:26 Steffen Loos wrote:

> > I guess country 00 means no country code?
> 
> Just try to set up "ieee80211_regdom=EU" for module "cfg80211".
> 
> ---8<---
>   # modprobe -v cfg80211 ieee80211_regdom=EU
> insmod /lib/modules/2.6.32-tuxonice-r5/kernel/net/wireless/cfg80211.ko
>  ieee80211_regdom=EU
> 
>   # dmesg
> cfg80211: Using static regulatory domain info
> cfg80211: Regulatory domain: EU
>          (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
>          (2402000 KHz - 2482000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
>          (5170000 KHz - 5190000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
>          (5190000 KHz - 5210000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
>          (5210000 KHz - 5230000 KHz @ 40000 KHz), (600 mBi, 2300 mBm)
>          (5230000 KHz - 5330000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
>          (5490000 KHz - 5710000 KHz @ 40000 KHz), (600 mBi, 3000 mBm)
> cfg80211: Calling CRDA for country: EU
> cfg80211: Calling CRDA for country: EU
> 
>   # iw reg get
> country EU:
>          (2402 - 2482 @ 40), (6, 20)
>          (5170 - 5190 @ 40), (6, 23), PASSIVE-SCAN
>          (5190 - 5210 @ 40), (6, 23), PASSIVE-SCAN
>          (5210 - 5230 @ 40), (6, 23), PASSIVE-SCAN
>          (5230 - 5330 @ 40), (6, 20), DFS, NO-IBSS
>          (5490 - 5710 @ 40), (6, 30), DFS, NO-IBSS
> --->8---

Thanks for your suggestion.  It won't play I'm afraid:

# modprobe -v cfg80211 ieee80211_regdom=EUinsmod /lib/modules/2.6.33-gentoo-
r1/kernel/net/wireless/cfg80211.ko ieee80211_regdom=EU
20:35:58 root@dell_xps:[/home/michael]# modprobe -v b43                         
insmod /lib/modules/2.6.33-gentoo-r1/kernel/net/mac80211/mac80211.ko 
insmod /lib/modules/2.6.33-gentoo-r1/kernel/drivers/ssb/ssb.ko 
insmod /lib/modules/2.6.33-gentoo-r1/kernel/drivers/net/wireless/b43/b43.ko 
qos=0

# iw reg get
country 00:
        (2402 - 2472 @ 40), (6, 20)
        (2457 - 2482 @ 20), (6, 20), PASSIVE-SCAN, NO-IBSS
        (2474 - 2494 @ 20), (6, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
        (5170 - 5250 @ 40), (6, 20), PASSIVE-SCAN, NO-IBSS
        (5735 - 5835 @ 40), (6, 20), PASSIVE-SCAN, NO-IBSS

From dmesg:

cfg80211: Using static regulatory domain info
cfg80211: Regulatory domain: 00
    (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
    (2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
    (2457000 KHz - 2482000 KHz @ 20000 KHz), (600 mBi, 2000 mBm)
    (2474000 KHz - 2494000 KHz @ 20000 KHz), (600 mBi, 2000 mBm)
    (5170000 KHz - 5250000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
    (5735000 KHz - 5835000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
cfg80211: Calling CRDA to update world regulatory domain
cfg80211: Calling CRDA for country: EU

Anyway, with the new kernel it now works in all channels, so that's good 
enough for me.  :-)
-- 
Regards,
Mick

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