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Bug#1008973: linux-image-amd64: Very slow wireless with MEDIATEK 7961

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Hi,

Le 2022-04-05 14:39, Xavier Chantry a écrit :
> 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.

Le 2022-04-06 10:19, Christoph Martin a écrit :
> I have the same Problem with an P14s and Mediathek 7921e.
> There is even about 30% package loss.
> 
> Christoph
> 
> Am 05.04.22 um 14:39 schrieb Xavier Chantry:
> > 
> > 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.

Le 2022-04-15 14:19, Julien Negros a écrit :
> Hi,
> 
> Same issue here, switching to linux-image-5.15.0-0.bpo.3-amd64 did the
> trick. Hope the next kernel version fixes this problem !
> 
> Cheers
> -- 
> Julien Négros
 
Linux 5.17.3 (uploaded to unstable earlier today) includes a lot of fixes for
Mediatek WLAN devices. Could you please check if that kernel fixes the slowness
you are seeing?

Cheers,
Vincent

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Bug#1008973: linux-image-amd64: Very slow wireless with MEDIATEK 7961 Xavier Chantry <chantry.xavier@gmail.com> - 2022-04-05 14:50 +0200
  Bug#1008973: linux-image-amd64: Very slow wireless with MEDIATEK 7961 Christoph Martin <martin@uni-mainz.de> - 2022-04-06 10:40 +0200
  Bug#1008973: (no subject) Julien Negros <julien.negros@enercoop.org> - 2022-04-15 14:40 +0200
    Bug#1008973: linux-image-amd64: Very slow wireless with MEDIATEK 7961 Vincent Blut <vincent.debian@free.fr> - 2022-04-19 16:00 +0200
      Bug#1008973: linux-image-amd64: Very slow wireless with MEDIATEK 7961 Julien Negros <julien.negros@enercoop.org> - 2022-04-20 14:40 +0200
        Bug#1008973: linux-image-amd64: Very slow wireless with MEDIATEK 7961 Julien Negros <julien.negros@enercoop.org> - 2022-06-15 12:50 +0200
  Processed: Re: Bug#1008973: linux-image-amd64: Very slow wireless  with MEDIATEK 7961 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2022-04-19 16:00 +0200
  Processed: Re: Bug#1008973: linux-image-amd64: Very slow wireless  with MEDIATEK 7961 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2022-04-19 16:00 +0200

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