Bug#986995: linux-image-5.10.0-6-amd64: cdc_acm acm_port_activate fails

To: Debian Bug Tracking System <986995@bugs.debian.org>
Subject: Bug#986995: linux-image-5.10.0-6-amd64: cdc_acm acm_port_activate fails
From: Yuri D'Elia <wavexx@thregr.org>
Date: Sun, 25 Apr 2021 16:32:13 +0200
Message-id: <YIV9bb8QeX//8RiY@eab21133nb>
Reply-to: Yuri D'Elia <wavexx@thregr.org>, 986995@bugs.debian.org
References: <161847713122.3512.2834547287170839736.reportbug@z14>

Source: linux
Version: 5.10.28-1
Followup-For: Bug #986995

I can confirm any device controlled by the acm driver has issues
starting with 5.10.28. Sometimes it's possible to just replug the serial
device to fix the issue, however for devices that reconnect after reset,
there's no work-around.

These include most MCU boards, such as arduino.
Downgrading to 5.10.0-6 (5.10.26-1) fixes the issue.

Relevant upstream bug reports:

https://bugzilla.kernel.org/show_bug.cgi?id=212751
https://bugzilla.kernel.org/show_bug.cgi?id=212725

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