[BUG] MediaTek MT7927 Wi-Fi not binding on linux-cachyos 7.1.1-2, works on linux-cachyos-lts 6.18.36

[slowmo115]

Pre-flight checklist

• I have searched existing issues and this is not a duplicate.
• I have read the Contributing Guidelines.
• I have verified the issue is reproducible with the latest available CachyOS kernel.
• I have tried to reproduce the issue on Arch Linux's linux kernel.

Upstream / vanilla kernel check

I have not tested with a vanilla/upstream kernel

Kernel variant

linux-cachyos (EEVDF, Clang)

System information (cachyos-bugreport.sh)

cachyos-bugreport.sh output was too long for the GitHub issue form limit of 65536 characters. Providing the relevant system information manually below.

Manual system information (if cachyos-bugreport.sh is unavailable)

Distro: CachyOS
Motherboard: ASUS ROG STRIX X870E-E GAMING WIFI
BIOS: 1701, 07/29/2025
Architecture: x86_64
Bootloader: GRUB 2.14
Wi-Fi adapter: MediaTek MT7927 / Filogic 380
Wi-Fi PCI ID: 14c3:7927
Wi-Fi subsystem: Foxconn International, Inc. Device 105b:e124

Broken kernel:
linux-cachyos 7.1.1-2-cachyos

Working kernel:
linux-cachyos-lts 6.18.36-1-cachyos-lts

Broken kernel behavior:
- Wi-Fi adapter appears in lspci.
- No Kernel driver in use is shown.
- ip link does not show wlan0.
- NetworkManager only shows Ethernet and loopback.

Working LTS behavior:
- wlan0 appears.
- lspci shows Kernel driver in use: mt7925e.
- NetworkManager can use Wi-Fi.

Bug description

After updating and rebooting into linux-cachyos 7.1.1-2, my onboard Wi-Fi stopped working.

The Wi-Fi adapter is detected by lspci as a MediaTek MT7927 / Filogic 380 with PCI ID 14c3:7927, but on linux-cachyos 7.1.1-2 no kernel driver binds to it. NetworkManager only shows Ethernet and loopback, and ip link does not show wlan0.

Booting into linux-cachyos-lts 6.18.36-1 fixes the issue. On the LTS kernel, wlan0 appears and lspci shows Kernel driver in use: mt7925e.

This looks like a regression in linux-cachyos 7.1.1-2 for the MT7927 / mt7925e driver.

Steps to reproduce

1. Boot CachyOS with linux-cachyos 7.1.1-2 on a system with MediaTek MT7927 / Filogic 380 Wi-Fi.
2. Check network devices with ip link or nmcli device.
3. Observe that wlan0 is missing and NetworkManager only shows Ethernet/loopback.
4. Check the adapter with lspci -nnk | grep -A5 -iE "network|wireless|wifi".
5. Observe that the MT7927 adapter is detected, but no Kernel driver in use is shown.
6. Boot the same system into linux-cachyos-lts 6.18.36-1.
7. Observe that wlan0 appears and lspci shows Kernel driver in use: mt7925e.

Expected behavior

The MediaTek MT7927 Wi-Fi adapter should bind to the mt7925e driver on linux-cachyos 7.1.1-2, wlan0 should appear, and NetworkManager should be able to scan and connect to Wi-Fi networks.

Actual behavior

On linux-cachyos 7.1.1-2, the MT7927 adapter is detected by lspci but no driver binds to it. wlan0 does not appear, and NetworkManager has no Wi-Fi device available.

Logs / stack traces

Broken kernel dmesg filter:

sudo dmesg | grep -iE "mt79|mt792|mediatek|wifi|firmware"

Output on linux-cachyos 7.1.1-2:

[    0.000000] DMI: ASUS System Product Name/ROG STRIX X870E-E GAMING WIFI, BIOS 1701 07/29/2025
[    3.357092] usb 1-9: Manufacturer: MediaTek Inc.
[    7.048991] systemd[1]: Clear Stale Hibernate Storage Info skipped, unmet condition check ConditionPathExists=/sys/firmware/efi/efivars/HibernateLocation-...
[    9.397289] amdgpu 0000:79:00.0: [drm] Loading DMUB firmware via PSP: version=0x05003000
[    9.397505] amdgpu 0000:79:00.0: [VCN instance 0] Found VCN firmware Version ENC: 1.33 DEC: 4 VEP: 0 Revision: 15

No mt7925e / MT7927 driver bind messages appear for the Wi-Fi adapter on the broken kernel.

lspci output on broken kernel:

09:00.0 Network controller [0280]: MEDIATEK Corp. MT7927 802.11be 320MHz 2x2 PCIe Wireless Network Adapter [Filogic 380] [14c3:7927]
        Subsystem: Foxconn International, Inc. Device [105b:e124]

modinfo mt7925e | grep -i alias on broken kernel:

alias:          pci:v000014C3d00007925sv*sd*bc*sc*i*
alias:          pci:v000014C3d00000717sv*sd*bc*sc*i*

Attempted manual bind:

sudo modprobe mt7925e
echo 14c3 7927 | sudo tee /sys/bus/pci/drivers/mt7925e/new_id

Result:

tee: /sys/bus/pci/drivers/mt7925e/new_id: Invalid argument

Additional system information

Distro: CachyOS
Motherboard: ASUS ROG STRIX X870E-E GAMING WIFI
BIOS: 1701, 07/29/2025
Architecture: x86_64
Bootloader: GRUB 2.14
Wi-Fi adapter: MediaTek MT7927 / Filogic 380
Wi-Fi PCI ID: 14c3:7927
Wi-Fi subsystem: Foxconn International, Inc. Device 105b:e124

Broken kernel:
linux-cachyos 7.1.1-2-cachyos

Working kernel:
linux-cachyos-lts 6.18.36-1-cachyos-lts

Working LTS lspci output:

09:00.0 Network controller [0280]: MEDIATEK Corp. MT7927 802.11be 320MHz 2x2 PCIe Wireless Network Adapter [Filogic 380] [14c3:7927]
Subsystem: Foxconn International, Inc. Device [105b:e124]
Kernel driver in use: mt7925e
Kernel modules: mt7925e

On the working LTS kernel, ip link shows wlan0 and NetworkManager can use Wi-Fi.

[Rumahu]

I'm on 7.0.12-1 and I've been using the MT7927 DKMS package while waiting for 7.1.x to release to the stable branch. The DKMS package is what eventually made its way into the 7.1 kernel release and added support for the Filogic 380. I was incorrect, it only made it to wireless-next, not the 7.1 kernel.

Here's a comment in the DKMS repo that provides a fix for 7.1; hopefully that helps!
jetm/mediatek-mt7927-dkms#85 (comment)