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In Jaunty, up to and including 2.6.28-7, if the Wireless network
regulatory domain needed setting manually for non USA regions such as
the European Union (EU) or Japan, an option was added for the cfg80211
module in /etc/modprobe.d/options.conf:
options cfg80211 ieee80211_regdom=EU
The kernel build config used:
CONFIG_WIRELESS_OLD_REGULATORY=y
In Ubuntu-2.6.28-8.21 the wireless-crda package was introduced to work
with udev to set the regulatory domain automatically. Therefore the
manual override was no longer used and the kernel build config changed
to:
# CONFIG_WIRELESS_OLD_REGULATORY is not set
However, if the manually added module option was left in place it causes
cfg80211 to fail to load, which in turn causes the wireless drivers to
fail to load too:
kernel: [ 379.889060] cfg80211: Unknown parameter `ieee80211_regdom'
sudo modprobe iwl3945
WARNING: Error inserting led_class
(/lib/modules/2.6.28-9-generic/kernel/drivers/leds/led-class.ko): Unknown
symbol in module, or unknown parameter (see dmesg)
WARNING: Error inserting mac80211
(/lib/modules/2.6.28-9-generic/kernel/net/mac80211/mac80211.ko): Unknown symbol
in module, or unknown parameter (see dmesg)
FATAL: Error inserting iwl3945
(/lib/modules/2.6.28-9-generic/kernel/drivers/net/wireless/iwlwifi/iwl3945.ko):
Unknown symbol in module, or unknown parameter (see dmesg)
The solution is to remove the module option, e.g:
sudo sed -i '/options cfg80211/ s/^.*$//' /etc/modprobe.d/options.conf
** Affects: ubuntu-release-notes
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Low
Assignee: Andy Whitcroft (apw)
Status: Won't Fix
** Affects: module-init-tools (Ubuntu)
Importance: Undecided
Assignee: Ubuntu Foundations Team (ubuntu-foundations)
Status: New
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Wifi driver will fail to load if regulatory domain set in module options
https://bugs.edge.launchpad.net/bugs/343026
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Foundations Team, which is a bug assignee.
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