Public bug reported:
After upgrading from Ubuntu kernel 6.8.0-134-generic to
6.8.0-147-generic, Wi-Fi connectivity became unreliable on my ASUS
VivoBook X1402ZA running Linux Mint (Ubuntu 24.04 base).
The affected wireless adapter is MediaTek MT7921 PCIe (PCI ID
14c3:7961), using the mt7921e driver.
Observed behavior on kernel 6.8.0-147:
Initially, the 5 GHz connection experienced intermittent stalls and
packet loss, including failures to reach the local gateway.
Subsequently, connecting to the 5 GHz SSID repeatedly failed.
WPA authentication/association sometimes succeeds, but DHCP requests
receive no response and NetworkManager reports ip-config-unavailable.
Kernel logs also show 4WAY_HANDSHAKE_TIMEOUT, authentication/association
timeouts and CLASS2_FRAME_FROM_NONAUTH_STA.
The 2.4 GHz connection generally works but has also shown intermittent
connection failures.
Recreating the 5 GHz NetworkManager connection profile did not resolve
the issue.
Expected behavior:
Stable Wi-Fi connectivity on both 2.4 GHz and 5 GHz, as observed with
kernel 6.8.0-134-generic.
Regression confirmation:
Booting the same laptop with kernel 6.8.0-134-generic immediately
restores working 5 GHz connectivity, without changing the router or
wireless hardware.
Both kernels report the same MediaTek firmware versions:
ASIC revision: 79610010
HW/SW Version: 0x8a108a10
Firmware build: 20240219110958a
WM firmware build: 20240219111038
Hardware and software:
Laptop: ASUS VivoBook X1402ZA
OS: Linux Mint, Ubuntu 24.04 base
Wi-Fi adapter: MediaTek MT7921 PCIe [14c3:7961]
Driver: mt7921e
Working kernel: 6.8.0-134-generic
Affected kernel: 6.8.0-147-generic
Please investigate this kernel regression affecting MT7921 Wi-Fi
connectivity. I can provide kernel and NetworkManager logs from both
working and failing boots.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: kernel-regression mt7921e wifi
** Attachment added: "Kernel logs from working and affected kernels,
NetworkManager logs and hardware information."
https://bugs.launchpad.net/bugs/2171496/+attachment/6010961/+files/wifi-bug-report.tar.gz
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https://bugs.launchpad.net/bugs/2171496
Title:
Wi-Fi regression in 6.8.0-147: MediaTek MT7921 (14c3:7961) fails on 5
GHz, works on 6.8.0-134
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