[Pkg-utopia-maintainers] Bug#802773: modemmanager: ModemManager holds onto the device after removal / reset, locking up device node

[Erwin Van de Velde]

Source: modemmanager
Version: 1.4.0-1
Severity: important

Dear Maintainer,

When resetting/unplugging 3G modems, modemmanager holds onto the ttyUSB device, resulting in an increase of the number of the ttyUSB device after reset or when the device is plugged in again. E.g. a device with ttyUSB7 will become ttyUSB8 or higher. This is a problem because when a reset is required more often (e.g. in our situation: driver issues requiring an occasional reset) the number keeps going up till reaching ttyUSB511, after which no new ttyUSB device can be assigned and the modems do not work properly anymore.

Restarting ModemManager resolves the issue and after a discussion on the Linux kernel mailling list I found that the issue has been solved in ModemManager 1.4.2. This fix should be added to Debian 8 too. (post: http://thread.gmane.org/gmane.linux.usb.general/132439/focus=132499)

-- System Information:
Debian Release: 8.2
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)