Bug#1151392: linux-image-6.12.113: EM7430 MBIM transaction timeouts mark modem invalid

From	Uwe Kleine-König <ukleinek@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1151392: linux-image-6.12.113: EM7430 MBIM transaction timeouts mark modem invalid
Date	2026-10-28 10:10 +0100
Message-ID	<NT7Pr-8oOg-9@gated-at.bofh.it> (permalink)
References	<NT7Pr-8oOg-11@gated-at.bofh.it> <NT7Pr-8oOg-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hello,

On Tue, Oct 20, 2026 at 09:30:09PM +0800, 杨统勋 wrote:
> Package: src:linux

Please report this bug against linux-image-$(uname -r). The upside is
that reportbug then collects some relevant info and adds it to the
report. Can you please follow up with this information by running

	reportbug -N 1151392

(At least for me this generates a mail with the information, but maybe
that is only because I run a newer kernel. If that doesn't work, do

	reportbug linux-image-$(uname -r)

select 1151392 in the bug list and provide a follow-up (using 'x').

> Version: 6.12.113-1
> Severity: normal
> Tags: upstream
> 
> Dear Maintainer,
> 
> Sierra Wireless EM7430 (USB 1199:9071) on a Panasonic Let's Note CF-SV8R11VS
> loses its MBIM channel repeatedly during the same boot. ModemManager 1.24.0
> reports 10 consecutive transaction timeouts on /dev/cdc-wdm0 (or ttyUSB2),
> declares the modem invalid and removes it, which drops mobile data.
> 
> Environment:
>   Debian 13 (trixie), linux-image 6.12.113-1, ModemManager 1.24.0
>   Firmware SWI9X30C_02.33.03.00 (Panasonic OEM, PRI 002.072_001)
>   SIM: China Unicom, APN 3gnet, AT+CPIN? -> READY

Is this a regression, i.e. did it work reliable with a previous (Debian)
kernel?

Best regards
Uwe

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Bug#1151392: linux-image-6.12.113: EM7430 MBIM transaction timeouts mark modem invalid Uwe Kleine-König <ukleinek@debian.org> - 2026-10-28 10:10 +0100
  Processed: Re: Bug#1151392: linux-image-6.12.113: EM7430 MBIM  transaction timeouts mark modem invalid "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-10-28 10:10 +0100

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