Bug#1008973: linux-image-amd64: Very slow wireless with MEDIATEK 7961
Package: linux-image-amd64
Version: 5.10.84-1
Severity: important
X-Debbugs-Cc: chantry.xavier@gmail.com
Dear Maintainer,
We have a problem with MEDIATEK 7961 wireless on Levono P14s with AMD
Ryzen.
With 5.10 kernel on debian stable the wireless just does not work, so we
installed kernel 5.16 from testing.
With kernel 5.16 the wireless is so slow that it's unusable, each
internet query takes several seconds. A simple ping to google.com varies
from 100ms to 3000ms.
With kernel 5.17 it's slighly better but the ping still goes up to
600ms.
With kernel 5.15 however, it works quite good, Internet is very usable,
ping varies from 3ms to 30ms.
(on the same network, the P14s with Intel wireless does better and is
always under 10ms).
It looks like big changes were made to the mt7921e driver in 5.16
according to Phoronix :
The Mediatek MT7921 WiFi driver has added support for 6GHz WiFi, active
state power management (ASPM), and other improvements.
And it looks like this caused a big regression with MEDIATEK 7961.
Besides the network performance problem on 5.16, suspend/resume is also
broken, while it works perfectly on 5.15.
-- System Information:
Debian Release: 11.2
APT prefers stable
APT policy: (900, 'stable'), (500, 'stable-updates'), (500, 'stable-security'), (1, 'experimental'), (1, 'unstable')
Architecture: amd64 (x86_64)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages linux-image-amd64 depends on:
ii linux-image-5.10.0-10-amd64 5.10.84-1
linux-image-amd64 recommends no packages.
linux-image-amd64 suggests no packages.
-- no debconf information
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