Bug#1132448: firmware-mediatek: Wifi perf degraded a lot after upgrade firmware-mediatek from 20250410-2 to 20260221-1~bpo13+1 and 20260309-1

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From	bob <ybzhao1989@hotmail.com>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1132448: firmware-mediatek: Wifi perf degraded a lot after upgrade firmware-mediatek from 20250410-2 to 20260221-1~bpo13+1 and 20260309-1
Date	Wed, 01 Apr 2026 08:30:02 +0200
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Package: firmware-mediatek
Version: 20260221-1~bpo13+1
Severity: important
X-Debbugs-Cc: ybzhao1989@hotmail.com, ybzhao1989@hotmail.com

Wifi perf degraded a lot after upgrade firmware-mediatek from 20250410-2 to
20260221-1~bpo13+1 and 20260309-1.
With the new firmware, the wifi iperf3 test speed is around 100MB/s within 1
minute connected to a wireless router, but it gradually downgrades to 10MB/s,
router iperf3 sends, pc receives.
After downgraded firmware-mediatek to 20250410-2, the problem is gone.

Please see also these similar reports:

https://www.reddit.com/r/archlinux/comments/1rsk5od/for_those_having_network_speed_issues_with_a/
https://bbs.archlinux.org/viewtopic.php?id=312031

> The most updated work version on archlinux is 20251125-2.


-- System Information:
Debian Release: forky/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'stable-updates'), (500, 'stable-security'), (500, 'oldstable-updates'), (500, 'unstable'), (500, 'stable'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.19.8+deb14-amd64 (SMP w/24 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

firmware-mediatek depends on no packages.

firmware-mediatek recommends no packages.

Versions of packages firmware-mediatek suggests:
ii  initramfs-tools  0.150

-- no debconf information

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Bug#1132448: firmware-mediatek: Wifi perf degraded a lot after upgrade firmware-mediatek from 20250410-2 to 20260221-1~bpo13+1 and 20260309-1 bob <ybzhao1989@hotmail.com> - 2026-04-01 08:30 +0200
  Bug#1132448: Info received (debian firmware-nonfree version 20251125-1 works) Ben Hutchings <benh@debian.org> - 2026-04-08 20:20 +0200

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