Arch Linux

manos00

Member

Registered: 2022-01-19

Posts: 11

[SOLVED] WiFi adapter disappeared after reboot (mt7921e)

I've been running Arch on my laptop for over a year now without any issues, but when I booted it yesterday the WiFi adapter suddenly was not showing up anymore.
I remember that on the last boot where the adapter was still working shutting down took very long. I waited about 5 minutes and then just forced the shutdown (hold power button).
Since that shutdown, all following shutdowns are just the same: No matter how long I wait, nothing happens.
The hardware seems to be detected but the interface is not displayed anywhere.

These outputs could be useful:

$ uname -r
6.16.8-arch1-1

$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever

$ lspci -k | grep -A 3 -i wireless
06:00.0 Network controller: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless Network Adapter
	Subsystem: Lenovo Device e0c7
	Kernel driver in use: mt7921e
	Kernel modules: mt7921e

$ systemctl status wpa_supplicant@wlp6s0
○ wpa_supplicant@wlp6s0.service - WPA supplicant daemon (for interface wlp6s0)
     Loaded: loaded (/usr/lib/systemd/system/wpa_supplicant@.service; enabled; preset: disabled)
     Active: inactive (dead)

Sep 20 23:33:42 thinkpadL13 systemd[1]: Dependency failed for WPA supplicant daemon (for interface wlp6s0).
Sep 20 23:33:42 thinkpadL13 systemd[1]: wpa_supplicant@wlp6s0.service: Job wpa_supplicant@wlp6s0.service/start failed with result 'dependency'.

$ rfkill list
0: tpacpi_bluetooth_sw: Bluetooth
	Soft blocked: no
	Hard blocked: no
1: tpacpi_wwan_sw: Wireless WAN
	Soft blocked: no
	Hard blocked: no
2: hci0: Bluetooth
	Soft blocked: no
	Hard blocked: no

This is different from what was usually shown here. I believe it was

hci0: Bluetooth

and

hci0: WiFi

or something similar (not 100% sure though).

$ systemctl status systemd-networkd
● systemd-networkd.service - Network Configuration
     Loaded: loaded (/usr/lib/systemd/system/systemd-networkd.service; enabled; preset: enabled)
     Active: active (running) since Sat 2025-09-20 23:32:12 CEST; 10min ago
 Invocation: e5a72c66ca6b41b9940e1b4eea5981d4
TriggeredBy: ● systemd-networkd.socket
             ● systemd-networkd-varlink.socket
       Docs: man:systemd-networkd.service(8)
             man:org.freedesktop.network1(5)
   Main PID: 485 (systemd-network)
     Status: "Processing requests..."
      Tasks: 1 (limit: 17569)
   FD Store: 0 (limit: 512)
     Memory: 4.2M (peak: 16.6M)
        CPU: 48ms
     CGroup: /system.slice/systemd-networkd.service
             └─485 /usr/lib/systemd/systemd-networkd

Sep 20 23:32:12 thinkpadL13 systemd[1]: Starting Network Configuration...
Sep 20 23:32:12 thinkpadL13 systemd-networkd[485]: lo: Link UP
Sep 20 23:32:12 thinkpadL13 systemd-networkd[485]: lo: Gained carrier
Sep 20 23:32:12 thinkpadL13 systemd[1]: Started Network Configuration.

Here are the outputs of journalctl for an example bad shutdown https://pastebin.com/ukmCWbem

and this should be the last boot where WiFi was working: https://pastebin.com/Kw9WPJyW

Maybe also worth mentioning: While researching this issue, someone suggested a BIOS update. When I was trying to do that (Laptop is a Lenovo Thinkpad L13 Gen3 btw) in the upgrade screen the utility just gave me "the process does not recognize this system", so I couldn't upgrade (I tried the newest version, as well as the successor version to the one installed). Idk if these issues are related, but I thought I'd share it just in case.

Oh and also I was able to use WiFi from a live USB and the chroot environment so hardware definitely seems to be fine.

Thanks a lot in advance!

Last edited by manos00 (2025-09-21 08:27:40)

Scimmia

Fellow

Registered: 2012-09-01

Posts: 13,247

Re: [SOLVED] WiFi adapter disappeared after reboot (mt7921e)

https://bbs.archlinux.org/viewtopic.php?id=308360
https://bbs.archlinux.org/viewtopic.php?id=308338
https://gitlab.archlinux.org/archlinux/ … /issues/29

Last edited by Scimmia (2025-09-20 22:09:08)

manos00

Member

Registered: 2022-01-19

Posts: 11

Re: [SOLVED] WiFi adapter disappeared after reboot (mt7921e)

Wow, I somehow did't catch that. Thank you for the quick reply! Downgrading fixed everything.