Thinkpad T61
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Wlan Problems
Ubuntu Lucid / 10.04.1
I encountered some problems with my wlan and had some strange errors in dmesg:
The first problem was:
iwl3945 0000:03:00.0: Failed to get channel info for channel 100 [0] iwl3945 0000:03:00.0: Failed to get channel info for channel 104 [0] iwl3945 0000:03:00.0: Failed to get channel info for channel 108 [0] iwl3945 0000:03:00.0: Failed to get channel info for channel 112 [0]
According to this opensuse bug i filed a solution in Ubuntu Bug #340418:
Add the following to a new file /etc/modprobe.d/options-iwl3945.conf:
options iwl3945 disable_hw_scan=0
For testing purpose do
rmmod -f iwl3945 && modprobe iwl3945 disable_hw_scan=0
The second problem was:
cfg80211: Leaving channel 5170 MHz intact on phy2 - no rule found in band on Country IE cfg80211: Leaving channel 5180 MHz intact on phy2 - no rule found in band on Country IE cfg80211: Leaving channel 5190 MHz intact on phy2 - no rule found in band on Country IE
This is a problem with the wlan setting with can easily solved by adding a script to Network Manager (according to [1] and [2]:
vim /etc/NetworkManager/dispatcher.d/01changeCRDA
#!/bin/sh
INTERFACE=$1
ACTION=$2
CODE="GB"
if [ "$ACTION" = "up" -a "$(echo $INTERFACE|grep wlan)" ];then
iw reg set ${CODE}
fi