[Bug 2118755] Re: mt7925e driver is unstable on 6GHz network

Still on 6.17 from Ubuntu 25.10. New firmware 20251015213201.

It looks like the WiFi 6E APs on the 6 GHz bands are still not visible,
but the WiFi 7 on the 6 GHz band are now visible.

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Title:
mt7925e driver is unstable on 6GHz network

Status in linux package in Ubuntu:
Triaged

Bug description:
UniFi APs setup at home, with WiFi 6E AP right above the laptop and
WiFi7 in another room. Previous laptop was ThinkPad P14s Gen2 with an
Intel AX210 swap and was 100% solid.

Migrated (copied disks) the system to a new ThinkPad P14s Gen6 AMD
that comes with a MediaTek chip, reporting as "c2:00.0 Network
controller: MEDIATEK Corp. Device 7925", with the mt7925e driver
taking care.

Using 25.04:
- the latest stable kernel was delivering poor wifi performances, barely 200Mbits, and IPv6 was broken
- using plucky-proposed kernel (6.14.0-26-generic), wifi performances improved (800Mbits over 5GHz/80MHz) and IPv6 was fixed
- 6GHz was not visible, "iw reg get" would report FR but cfg80211 would report WORLD
- forcing modprobe with "options cfg80211 ieee80211_regdom=FR" I get 6Ghz working, and decent speed (1.25Gbits up / 1.5 Gbits down) with iperf3

However on a regular basis (10-15 min, sometime less) WiFi link is
lost for one second and dmesg reflects:

juil. 25 09:50:59 portable-alex kernel: wlp194s0: Connection to AP 62:22:32:6e:xx:xx lost
juil. 25 09:51:00 portable-alex wpa_supplicant[2781]: wlp194s0: CTRL-EVENT-DISCONNECTED bssid=62:22:32:6e:06:9a reason=4 locally_generated=1
juil. 25 09:51:00 portable-alex wpa_supplicant[2781]: wlp194s0: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
juil. 25 09:51:00 portable-alex wpa_supplicant[2781]: wlp194s0: CTRL-EVENT-REGDOM-CHANGE init=USER type=COUNTRY alpha2=FR
juil. 25 09:51:00 portable-alex NetworkManager[2776]: <info> [1753429860.3779] device (wlp194s0): supplicant interface state: completed -> disconnected
juil. 25 09:51:00 portable-alex NetworkManager[2776]: <info> [1753429860.3779] device (p2p-dev-wlp194s0): supplicant management interface state: completed -> disconnected

From there it disconnects from the 6Ghz frequency, and quickly
recovers to a 5.2GHz and then a few minutes laters, it goes back to
the 6GHz frequency:

juil. 25 09:56:01 portable-alex wpa_supplicant[2781]: wlp194s0: Reject scan trigger since one is already pending
juil. 25 09:56:10 portable-alex wpa_supplicant[2781]: wlp194s0: SME: Trying to authenticate with 62:22:32:6e:06:9a (SSID='Livebox-XX' freq=6135 MHz)
juil. 25 09:56:11 portable-alex kernel: wlp194s0: disconnect from AP 94:2a:6f:b0:xx:xx for new auth to 62:22:32:6e:06:9a
juil. 25 09:56:11 portable-alex kernel: wlp194s0: authenticate with 62:22:32:6e:xx:xx (local address=84:9e:56:e3:c6:27)
juil. 25 09:56:11 portable-alex kernel: wlp194s0: send auth to 62:22:32:6e:xx:xx (try 1/3)
juil. 25 09:56:11 portable-alex NetworkManager[2776]: <info> [1753430171.2712] device (wlp194s0): supplicant interface state: completed -> authenticating
juil. 25 09:56:11 portable-alex NetworkManager[2776]: <info> [1753430171.2712] device (p2p-dev-wlp194s0): supplicant management interface state: completed -> authenticating
juil. 25 09:56:11 portable-alex wpa_supplicant[2781]: wlp194s0: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
juil. 25 09:56:11 portable-alex wpa_supplicant[2781]: wlp194s0: CTRL-EVENT-REGDOM-CHANGE init=USER type=COUNTRY alpha2=FR
juil. 25 09:56:11 portable-alex wpa_supplicant[2781]: wlp194s0: Trying to associate with 62:22:32:6e:xx:xx (SSID='Livebox-XX' freq=6135 MHz)

I am not sure if the "CTRL-EVENT-REGDOM-CHANGE" messages are a symptom
of why it looses the link, or a consequence.

This is resulting in a not so good experience, with the network being
fast enough and then suddenly slow a bit then goes back better.

ProblemType: Bug
DistroRelease: Ubuntu 25.04
Package: linux-image-6.14.0-28-generic 6.14.0-28.28
ProcVersionSignature: Ubuntu 6.14.0-28.28-generic 6.14.8
Uname: Linux 6.14.0-28-generic x86_64
ApportVersion: 2.32.0-0ubuntu5.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Jul 25 09:56:10 2025
HibernationDevice: RESUME=/dev/mapper/vg--ubuntu-lv--ubuntu--swap
InstallationDate: Installed on 2022-07-04 (1117 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
MachineType: LENOVO 21RVCTO1WW
ProcEnviron:
LANG=fr_FR.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.14.0-28-generic root=/dev/mapper/vg--ubuntu-lv--ubuntu--root ro rootflags=subvol=@ quiet splash resume=/dev/mapper/vg--ubuntu-lv--ubuntu--swap crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.14.0-28-generic N/A
linux-backports-modules-6.14.0-28-generic N/A
linux-firmware 20250317.git1d4c88ee-0ubuntu1.3
SourcePackage: linux
UpgradeStatus: Upgraded to plucky on 2025-03-28 (119 days ago)
dmi.bios.date: 06/03/2025
dmi.bios.release: 1.13
dmi.bios.vendor: LENOVO
dmi.bios.version: R2XET33W (1.13 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21RVCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.7
dmi.modalias: dmi:bvnLENOVO:bvrR2XET33W(1.13):bd06/03/2025:br1.13:efr1.7:svnLENOVO:pn21RVCTO1WW:pvrThinkPadP14sGen6AMD:rvnLENOVO:rn21RVCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21RV_BU_Think_FM_ThinkPadP14sGen6AMD:
dmi.product.family: ThinkPad P14s Gen 6 AMD
dmi.product.name: 21RVCTO1WW
dmi.product.sku: LENOVO_MT_21RV_BU_Think_FM_ThinkPad P14s Gen 6 AMD
dmi.product.version: ThinkPad P14s Gen 6 AMD
dmi.sys.vendor: LENOVO

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