Public bug reported:
After upgrading to Ubuntu 26.04.1 LTS, Wi-Fi on a MediaTek MT7921K
(Gigabyte GC-WBAX1200, driver mt7921e) has heavy packet loss.
Pinging the local router (signal -41 dBm, 2.4 GHz):
- kernel 7.0.0-38-generic: ~55% packet loss, latency spikes up to 450 ms
- kernel 7.0.0-34-generic: ~7% packet loss, normal latency
On 5 GHz the loss on 7.0.0-38 is 45-60%.
Other devices on the same network work without problems.
Already tried without success: disable_aspm=1, Wi-Fi power save off,
Bluetooth disabled, locking to a single BSSID.
Workaround: booting 7.0.0-34-generic.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-38-generic 7.0.0-38.38
ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: darko 4935 F.... wireplumber
/dev/snd/controlC0: darko 4935 F.... wireplumber
/dev/snd/seq: darko 4916 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 8 18:16:53 2026
InstallationDate: Installed on 2025-11-10 (332 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
MachineType: Gigabyte Technology Co., Ltd. X570 AORUS PRO
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 nvidia-drmdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-38-generic
root=UUID=90ed7cdb-1a4d-4848-b867-9f9d86f55577 ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-10-08 (0 days ago)
dmi.bios.date: 03/22/2024
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: F38
dmi.board.asset.tag: Default string
dmi.board.name: X570 AORUS PRO
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: Default string
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrF38:bd03/22/2024:br5.17:svnGigabyteTechnologyCo.,Ltd.:pnX570AORUSPRO:pvr-CF:rvnGigabyteTechnologyCo.,Ltd.:rnX570AORUSPRO:rvrDefaultstring:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:pfaX570MB:
dmi.product.family: X570 MB
dmi.product.name: X570 AORUS PRO
dmi.product.sku: Default string
dmi.product.version: -CF
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2170215
Title:
MT7921K (mt7921e) severe packet loss on 7.0.0-38, works on 7.0.0-34
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