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Suddenly, after upgrade to Linux kernel 3.11.0-19, my wireless card with the ath9k driver is no longer seeing the 13th channel, even though it worked fine for the last year and half. It also still works fine on another Ubuntu laptop and an Android phone.

How can I re-enable the 13th channel? It is very necessary as most of the channels are taken here.

Vadim Peretokin
  • 3,330

3 Answers3

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I seem to be having the same problem with Ubuntu 20.04, switching from Kernel 5.4.x to 5.13.x. Installing wireless-crda did not help at all. On an Arch Linux forum I found the remark that crda is actually deprecated over wireless-regdb.

Anyway. What solved it for me, was to force the regdomain when loading the cfg80211 module:

Add a file /etc/modprobe.d/cfg80211.conf with the content

options cfg80211 ieee80211_regdom=DE # or your country's 2-char ISO code.
bowfinger26
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I installed the wireless-crda and the iw packages which automatically seem to have fixed things, before I saw these replies. Thank you for the answers, however!

Vadim Peretokin
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You need to set your regulatory domain

Edit your /etc/default/crda and set your country code.

There is more info by running dmesg.

See. regulatory domain

Community
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