The module exists and is loaded.
ubuntu@rpi-400-4gb-rev1d0-5e8e:~$ uname -a
Linux rpi-400-4gb-rev1d0-5e8e 7.0.0-1021-raspi #21-Ubuntu SMP PREEMPT_DYNAMIC
Mon Sep 14 19:42:07 UTC 2026 aarch64 GNU/Linux
ubuntu@rpi-400-4gb-rev1d0-5e8e:~$ lsmod | grep brcm
brcmfmac_cyw 12288 0
brcmfmac 507904 1 brcmfmac_cyw
brcmutil 28672 1 brcmfmac
cfg80211 1372160 2 brcmfmac_cyw,brcmfmac
i2c_brcmstb 24576 0
ubuntu@rpi-400-4gb-rev1d0-5e8e:~$ modinfo brcmfmac-cyw
filename:
/lib/modules/7.0.0-1021-raspi/kernel/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cyw/brcmfmac-cyw.ko.zst
import_ns: BRCMFMAC
license: Dual BSD/GPL
description: Broadcom FullMAC WLAN driver plugin for Cypress/Infineon
chipsets
srcversion: EDC6A59C171B416E52E134B
depends: cfg80211,brcmfmac
intree: Y
name: brcmfmac_cyw
vermagic: 7.0.0-1021-raspi SMP preempt mod_unload modversions aarch64
sig_id: PKCS#7
signer: Build time autogenerated kernel key
sig_key: 42:96:CC:5F:50:A5:28:1D:13:A2:1C:CB:53:29:99:83:2F:FE:12:FF
sig_hashalgo: sha512
signature: 6B:67:AF:F7:AA:B7:91:29:8C:DA:B2:5E:6D:F9:68:B7:71:EE:04:97:
83:F0:5E:B7:FC:62:89:0A:C4:65:3D:3D:91:20:76:C9:E3:33:FD:B3:
1F:D9:98:03:A0:1B:53:DA:90:DA:D8:79:33:8B:0A:50:76:45:2D:C0:
2E:1C:57:6A:AC:C3:A0:77:8A:4A:65:90:3A:19:7D:6F:AA:BD:B2:0B:
67:3D:33:07:DA:EB:2C:75:72:03:D3:C9:AF:B5:89:D8:5E:16:6C:02:
BF:40:0F:A7:96:94:D5:82:B4:B6:D3:27:F3:E1:F4:E6:CA:4E:B2:EC:
41:71:06:C2:FF:55:E4:F7:3D:63:3E:E8:B8:D8:3A:6C:8D:14:E1:37:
19:BD:A8:95:E8:F3:56:96:29:29:EE:30:98:00:72:B1:0F:B0:18:29:
91:09:A5:6D:13:08:8B:F7:01:16:11:35:95:C9:C0:53:7A:85:8F:75:
61:B8:9E:F0:A8:F6:20:35:2C:68:D4:F2:24:61:34:20:2F:FE:FF:3F:
E5:12:31:F9:D7:76:5F:4A:04:56:CC:D6:E3:2E:B1:6A:57:C8:10:AE:
BF:2B:1D:3F:76:B7:06:7C:97:69:D9:B1:C1:B7:07:EE:E8:BA:D7:93:
E4:89:86:19:90:43:AD:1E:D9:CB:FB:57:8C:91:83:D6:70:8A:72:F5:
38:73:F3:8E:72:00:27:6C:BC:B7:F3:75:83:3D:88:11:0B:0C:57:03:
A9:67:B1:EA:A5:85:75:33:80:60:46:04:C8:6C:9B:6A:97:90:F3:47:
17:AC:8F:35:08:54:99:17:9E:DC:87:33:DC:D5:52:E4:FA:48:83:E9:
05:01:96:98:1E:9B:EA:5E:86:E7:8A:65:68:7C:81:E6:5D:BA:34:E7:
88:09:44:89:11:07:B7:EE:2E:12:C4:5F:77:9F:56:8A:0A:63:80:9E:
25:A4:D6:93:40:66:54:FA:9A:E6:CF:9C:31:90:3F:89:97:39:6D:95:
4F:84:9D:95:22:82:87:2C:8B:A0:69:3B:84:8C:E9:91:E6:D1:52:9E:
22:A6:B3:72:ED:20:EB:A9:4E:B2:46:56:C9:38:A0:96:3A:84:CB:36:
17:85:56:09:AF:85:06:5B:77:59:7F:F2:FC:0F:B2:C4:2F:AF:3C:E5:
C0:C0:DA:FE:29:47:14:2D:4C:38:E0:03:E1:B9:F4:BB:8B:82:64:83:
E4:0D:AE:54:75:AB:E0:AF:81:34:CC:86:FA:26:66:CF:EB:4E:E6:F2:
99:7D:8D:56:4C:92:A5:FF:F2:69:4A:8B:14:25:98:1B:0B:57:7A:E2:
76:EE:1F:84:A4:35:E9:E3:21:9F:09:82
ubuntu@rpi-400-4gb-rev1d0-5e8e:~$ sudo dmesg | grep brcmf
[ 13.220473] brcmfmac: F1 signature read @0x18000000=0x15294345
[ 13.229172] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43456-sdio
for chip BCM4345/9
[ 13.230275] usbcore: registered new interface driver brcmfmac
[ 13.661660] brcmfmac: brcmf_c_process_txcap_blob: no txcap_blob available
(err=-2)
[ 13.669934] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/9 wl0: May 14
2020 17:26:08 version 7.84.17.1 (r871554) FWID 01-3d9e1d87
[ 15.694933] brcmfmac: brcmf_cfg80211_set_power_mgmt: power save enabled
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https://bugs.launchpad.net/bugs/2168469
Title:
[SRU][Regression] linux-raspi 7.0.0-1021.21 drops brcmfmac-cyw.ko,
breaking Wi-Fi on RPi 400
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