[REGRESSION] [BISECTED] MT7925 wireless speed drops to zero since kernel 6.14.3 - wifi: mt76: mt7925: integrate *mlo_sta_cmd and *sta_cmd

[Tal Inbar]

typo, laptop model is:
Lenovo IdeaPad Slim 5 16AKP10

On Fri, Aug 8, 2025 at 4:14 PM Tal Inbar <inbartdev at gmail.com> wrote:
>
> Hi,
>
> Since kernel v6.14.3, when using wireless to connect to my home router
> on my laptop, my wireless connection slows down to unusable speeds.
>
>
> More specifically, since kernel 6.14.3, when connecting to the
> wireless networks of my OpenWRT Router on my Lenovo IdeaPad Slim 15
> 16AKP10 laptop,
> either a 2.4ghz or a 5ghz network, the connection speed drops down to
> 0.1-0.2 Mbps download and 0 Mbps upload when measured using
> speedtest-cli.
> My laptop uses an mt7925 chip according to the loaded driver and firmware.
>
>
> Detailed Description:
>
> As mentioned above, my wireless connection becomes unusable when using
> linux 6.14.3 and above, dropping speeds to almost 0 Mbps,
> even when standing next to my router. Further, pinging archlinux.org
> results in "Temporary failure in name resolution".
> Any other wireless device in my house can successfully connect to my
> router and properly use the internet with good speeds, eg. iphones,
> ipads, raspberry pi and a windows laptop.
> When using my Lenovo laptop on a kernel 6.14.3 or higher to connect to
> other access points, such as my iPhone's hotspot and some TPLink and
> Zyxel routers - the connection speed is good, and there are no issues,
> which makes me believe there's something going on with my OpenWRT
> configuration in conjunction with a commit introduced on kernel 6.14.3
> for the mt7925e module as detailed below.
>
> I have followed a related issue previously reported on the mailing
> list regarding a problem with the same wifi chip on kernel 6.14.3, but
> the merged fix doesn't seem to fix my problem:
> https://lore.kernel.org/linux-mediatek/EmWnO5b-acRH1TXbGnkx41eJw654vmCR-8_xMBaPMwexCnfkvKCdlU5u19CGbaapJ3KRu-l3B-tSUhf8CCQwL0odjo6Cd5YG5lvNeB-vfdg=@pm.me/
>
> I've tested stable builds of 6.15 as well up to 6.15.9 in the last
> month, which also do not fix the problem.
> I've also built and bisected v6.14 on june using guides on the Arch
> Linux wiki, for the following bad commit, same as the previously
> mentioned reported issue:
>
> [80007d3f92fd018d0a052a706400e976b36e3c87] wifi: mt76: mt7925:
> integrate *mlo_sta_cmd and *sta_cmd
>
> Testing further this week, I cloned mainline after 6.16 was released,
> built and tested it, and the issue still persists.
> I reverted the following commits on mainline and retested, to
> successfully see good wireless speeds:
>
> [0aa8496adda570c2005410a30df963a16643a3dc] wifi: mt76: mt7925: fix
> missing hdr_trans_tlv command for broadcast wtbl
> [cb1353ef34735ec1e5d9efa1fe966f05ff1dc1e1] wifi: mt76: mt7925:
> integrate *mlo_sta_cmd and *sta_cmd
>
> Then, reverting *only* 0aa8496adda570c2005410a30df963a16643a3dc causes
> the issue to reproduce, which confirms the issue is caused by commit
> cb1353ef34735ec1e5d9efa1fe966f05ff1dc1e1 on mainline.
>
> I've attached the following files to a bugzilla ticket:
>
> - lspci -nnk output:
> https://bugzilla.kernel.org/attachment.cgi?id=308466
>
> - dmesg output:
> https://bugzilla.kernel.org/attachment.cgi?id=308465
>
> - .config for the built mainline kernel:
> https://bugzilla.kernel.org/attachment.cgi?id=308467
>
>
> More information:
>
> OS Distribution: Arch Linux
>
> Linux build information from /proc/version:
> Linux version 6.16.0linux-mainline-11853-g21be711c0235
> (tal at arch-debug) (gcc (GCC) 15.1.1 20250729, GNU ld (GNU Binutils)
> 2.45.0) #3 SMP PREEMPT_DYNAMIC
>
> OpenWRT Version on my Router: 24.10.2
>
> Laptop Hardware:
> - Lenovo IdeaPad Slim 15 16AKP10 laptop (x86_64 Ryzen AI 350 CPU)
> - Network device as reported by lscpi: 14c3:7925
> - Network modules and driver in use: mt7925e
> - mediatek chip firmware as of dmesg:
>   HW/SW Version: 0x8a108a10, Build Time: 20250526152947a
>   WM Firmware Version: ____000000, Build Time: 20250526153043
>
>
> Referencing regzbot:
>
> #regzbot introduced: 80007d3f92fd018d0a052a706400e976b36e3c87
>
>
> Please let me know if any other information is needed, or if there is
> anything else that I can test on my end.
>
> Thanks,
> Tal Inbar