It isn't trivial, it's extraordinarily expensive - we run modprobe
several hundred times during a normal boot, having to check the module
options against the module would add a significant penalty!
** Changed in: module-init-tools (Ubuntu)
Assignee: Ubuntu Foundations Team (ubuntu-foundations) => Scott James
Remnant (scott)
--
Wifi driver will fail to load if regulatory domain set in module options
https://bugs.launchpad.net/bugs/343026
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Foundations Team, which is a bug assignee.
Status in Ubuntu Release Notes: New
Status in “linux” source package in Ubuntu: Won't Fix
Status in “module-init-tools” source package in Ubuntu: New
Bug description:
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
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