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bug#49611: Despite wireless-regdb being installed in my operating-system

From: Guillaume Le Vaillant
Subject: bug#49611: Despite wireless-regdb being installed in my operating-system, dmesg indicates it can't find `regulatory.db`
Date: Sun, 18 Jul 2021 19:17:21 +0000

Brice Waegeneire <brice@waegenei.re> skribis:

> Hello Katherine,
> TL;DR: “iw reg set US” correctly set the regulatory region from userland
> but Guix can't set it just from the kernel.
> Katherine Cox-Buday <cox.katherine.e@gmail.com> writes:
>> [    8.280462] cfg80211: Loading compiled-in X.509 certificates for
>> regulatory database
>> [    8.282686] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
>> [    8.284394] platform regulatory.0: Direct firmware load for
>> regulatory.db failed with error -2
>> [    8.284415] cfg80211: failed to load regulatory.db
> There is three way to make the module cfg80211 load a regulatory
> database:
> 1. Baking the DB into the kernel at build time by replacing the kernel's
>   limited DB with the one from 'wireless-regdb' via the option
> 2. Loading the DB at boot time as a signed firmware file
>   (lib/firmware/regulatory.db from 'wirerless-regdb') via the module
>   'cfg80211'.
> 3. Doing it in userland with the helper 'crda' trough the utility
>   'iwd' or its predecesor 'wpa_supplicant'.²
> From what I understand and what I tested, only the third method works in
> Guix System ATM.  It could be usefull to also support the first or
> second method to not depend on the userland setting the wireless
> regulatory settings.


You could also try adding "cfg80211.ieee80211_regdom=US" to the
'kernel-arguments' field of your 'operating-system' definition.

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