wpa_supplicant: can't get wifi up and running on RPI4

[brianmay]

Describe the bug

Immediately after upgrading from nixos24.05 to nixos24.11, wifi networking stopped. Before rebooting in fact. Rebooting to new kernel doesn't help.

Logs give a lot of message along the lines of "brcmfmac: brcmf_set_channel: set chanspec: 0xXXXX fail, reason -52"

This leads me to google search results like raspberrypi/linux#6049 which blame wpa_supplicant 2.11 and say I should downgrade to wpa_supplicant 2.10.

Unfortunately I can't see any easy way of overriding the wpa_supplicant to 2.10 without downgrading back to nixos-24.05.

Steps To Reproduce

Steps to reproduce the behavior:

1. Have working wifi on nixos 24.05
2. Upgrade to nixos 24.11

Expected behavior

Networking should continue to work

Metadata

• system: "aarch64-linux"
• host os: Linux 6.6.31, NixOS, 24.11 (Vicuna), 24.11.20241128.c71ad5c
• multi-user?: no
• sandbox: yes
• version: nix-env (Nix) 2.24.10
• nixpkgs: not found

(nixpkgs not found because there was no networking)

Notify maintainers

@MarcWeber @Ma27

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[brianmay]

Never mind, I was on completely the wrong track entirely.

This changed fixed it.

-    networks = { PENGUINS.psk = "ext:PSK_PENGUINS"; };
+    networks = {PENGUINS.pskRaw = "ext:PSK_PENGUINS";};

The docs led me to believe that pskRaw is for hex format passwords only. But plan-text passwords also work fine.