Thinkpad T61

Wlan / bluetooth switch - prevent bluetooth

I don't use bluetooth. But if i switch of the radio button for wlan and bluethooth off and on, both devices come up.

The bluethooth device is a Broadcom one:

> udevadm monitor --udev
UDEV  [1285453647.905188] remove   /devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1:1.0/bluetooth/hci0 (bluetooth)

> udevadm info --attribute-walk --path=/sys/bus/usb/devices/3-1/3-1\:1.0
 looking at device '/bus/usb/devices/3-1/3-1:1.0':
   KERNEL=="3-1:1.0"
   SUBSYSTEM=="usb"
   DRIVER=="btusb"
   ATTR{bInterfaceNumber}=="00"
   ATTR{bAlternateSetting}==" 0"
   ATTR{bNumEndpoints}=="03"
   ATTR{bInterfaceClass}=="e0"
   ATTR{bInterfaceSubClass}=="01"
   ATTR{bInterfaceProtocol}=="01"
   ATTR{modalias}=="usb:v0A5Cp2110d0100dcE0dsc01dp01icE0isc01ip01"
   ATTR{supports_autosuspend}=="1"

On boot i prevent bluetooth from coming up via:

vim /etc/rc.local

echo disable > /proc/acpi/ibm/bluetooth

So edit a custom udev rule

vim /etc/udev/rules.d/10-disable-initial-T61-bluetooth

# Broadcom Bluetooth vom T61 abschalten
SUBSYSTEM=="usb", KERNEL=="3-1:1.0", ACTION=="add", RUN+="/path/to/bin/disable_bluetooth"

Edit the according bluethooth-disable skript and make it accessible:

vim /path/to/bin/disable_bluetooth

#!/bin/sh
echo disable  > /proc/acpi/ibm/bluetoot

chmod 755 /path/to/bin/disable_bluetooth

and reload udev:

sudo service udev reload && sudo udevadm trigger

That's it ;)

Wlan Problems

Ubuntu Lucid / 10.04.1 64bit

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 a new file to /etc/modprobe.d/:

vim /etc/modprobe.d/options-iwl3945.conf

with the following content

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

Look at dmesg like this:

dmesg | grep cfg | grep country

You'll see something like this

cfg80211: Calling CRDA for country: GB
cfg80211: Received country IE:

To set the right country for your card (here GB) you have to install the program iw

sudo apt-get install iw

Then you can manually do

sudo iw reg set GB

and you'll see in dmesg:

cfg80211: Regulatory domain changed to country: GB

To automate this process you can write a so called dispatcher script for network manager (according to [1] and [2]):

vim /etc/NetworkManager/dispatcher.d/01changeCRDA

and add

#!/bin/sh
INTERFACE=$1
ACTION=$2
CODE="GB" 

if [ "$ACTION" = "up" -a "$(echo $INTERFACE|grep wlan)" ];then
       iw reg set ${CODE}
fi