Thomas Bächler wrote:
Using iwl3945 from compat-wireless, I can not use all the channels I
should be allowed to use. In particular, I cannot see some 802.11a
networks which I could see with ipw3945. Here is what I get:
iwl3945: Tunable channels: 13 802.11bg, 23 802.11a channels
But:
# ./iw dev wlan0 info
Band 1:
Frequencies:
* 2412 MHz
* 2417 MHz
* 2422 MHz
* 2427 MHz
* 2432 MHz
* 2437 MHz
* 2442 MHz
* 2447 MHz
* 2452 MHz
* 2457 MHz
* 2462 MHz
* 2467 MHz (disabled, passive scanning, no IBSS)
* 2472 MHz (disabled, passive scanning, no IBSS)
Bitrates:
* 1.0 Mbps
* 2.0 Mbps (short preamble supported)
* 5.5 Mbps (short preamble supported)
* 11.0 Mbps (short preamble supported)
* 6.0 Mbps
* 9.0 Mbps
* 12.0 Mbps
* 18.0 Mbps
* 24.0 Mbps
* 36.0 Mbps
* 48.0 Mbps
* 54.0 Mbps
Band 2:
Frequencies:
* 5170 MHz (disabled, passive scanning, no IBSS)
* 5180 MHz
* 5190 MHz (disabled, passive scanning, no IBSS)
* 5200 MHz
* 5210 MHz (disabled, passive scanning, no IBSS)
* 5220 MHz
* 5230 MHz (disabled, passive scanning, no IBSS)
* 5240 MHz
* 5260 MHz (passive scanning, no IBSS, radar detection)
* 5280 MHz (passive scanning, no IBSS, radar detection)
* 5300 MHz (passive scanning, no IBSS, radar detection)
* 5320 MHz (passive scanning, no IBSS, radar detection)
* 5500 MHz (disabled, passive scanning, no IBSS, radar detection)
* 5520 MHz (disabled, passive scanning, no IBSS, radar detection)
* 5540 MHz (disabled, passive scanning, no IBSS, radar detection)
* 5560 MHz (disabled, passive scanning, no IBSS, radar detection)
* 5580 MHz (disabled, passive scanning, no IBSS, radar detection)
* 5600 MHz (disabled, passive scanning, no IBSS, radar detection)
* 5620 MHz (disabled, passive scanning, no IBSS, radar detection)
* 5640 MHz (disabled, passive scanning, no IBSS, radar detection)
* 5660 MHz (disabled, passive scanning, no IBSS, radar detection)
* 5680 MHz (disabled, passive scanning, no IBSS, radar detection)
* 5700 MHz (disabled, passive scanning, no IBSS, radar detection)
Bitrates:
* 6.0 Mbps
* 9.0 Mbps
* 12.0 Mbps
* 18.0 Mbps
* 24.0 Mbps
* 36.0 Mbps
* 48.0 Mbps
* 54.0 Mbps
Most of the 802.11a channels are disabled, as are channel 12 and 13 in
the 802.11g band (I am sure those 11g channels should be enabled).
If you're in the EU, I contributed a fix that has not yet made it into
the iwlwifi code as it is under review (the whole regulatory aspect is
difficult, there are so many caveats!).
Temporarily I'd suggest that you add:
options cfg80211 ieee80211_regdom="JP"
into your /etc/modprobe.conf as it will enable the 2.4GHz channel 12 and
13 for you, I'm not sure that the 802.11a channels will be correct, but
it's better than it was.
Eventually this should become:
options cfg80211 ieee80211_regdom="EU"
once things are correctly defined again. But it may take a little while.
I need to check what's in 2.6.25 before I think about tweaking my patch,
but it will depend on John Linville as to whether it goes in to the
mainline kernel.
All a bit tricky!
A look here would be useful as a starting point:
http://en.wikipedia.org/wiki/List_of_WLAN_channels
but be aware there is a lot of legislation that affects the available
frequencies and it's not easy to get an overview of what is and isn't
allowed.
--
Brian
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