Hello Linux Wireless developers,
This is my first time sending a bug and I did my best to follow best
practices - please advise in the event that I haven't.
-----------------------
Issue Description
-----------------------
I have a WiFi card based on the MediaTek MT7921 (Device ID 7902)
chipset which is not being recognized by the `mt7921e` driver on
recent Arch Linux kernels.
**Hardware Information:**
Output of `lspci -nnk -d 14c3:7902`:
08:00.0 Network controller [0280]: MEDIATEK Corp. Device [14c3:7902]
Subsystem: AzureWave Device [1a3b:6040]
Kernel modules: mt7921e
(Note: `lspci -k` shows no "Kernel driver in use" for this device).
**System Information:**
* Distribution: Arch Linux (kept up-to-date with `pacman -Syu`)
* Kernels Tested (where issue occurs):
* `6.14.2-arch1-1` (Standard Arch kernel)
* `6.12.23-1-lts` (Arch LTS kernel)
**Problem Description:**
The WiFi card is detected by `lspci`, but no driver is automatically
loaded. The `mt7921e` module exists on the system, but does not appear
to claim the device, likely due to a missing PCI ID alias.
**Diagnostics:**
1. `lspci -k` output for the device shows no "Kernel driver in use".
2. Checking the module information on both tested kernels confirms
the specific PCI ID is missing from the aliases:
```bash
# modinfo mt7921e | grep 7902
(This command returns no output)
```
3. `ip link` does not show any `wlanX` interface.
4. Manually loading the module (`sudo modprobe mt7921e`) does not
result in the interface appearing, and `dmesg` shows no specific
errors or probing messages from `mt7921e` related to this device
(08:00.0).
5. A search of a local kernel git repository log (using `git log
-S'7902' -- drivers/net/wireless/mediatek/mt76/mt7921/` and `--grep`)
did not reveal any obvious commits adding support for this specific
PCI ID (`14c3:7902`).
**Expected Behavior:**
The `mt7921e` driver should recognize the `14c3:7902` PCI ID (with
subsystem `1a3b:6040`), bind to the device, and create a functional
`wlanX` network interface.
Could support for this specific PCI ID (`14c3:7902`, Subsystem
`1a3b:6040`) be added to the `mt7921e` driver? Please let me know if
any further information or testing is required.
Thank you for your time and work on the Linux kernel.
Best regards,
Nick Popovic
