Public bug reported:
Binary package hint: modemmanager
When connecting an embedded processor via usb (beagleboard or overo),
modemmanager immediately starts sending commands to the device with no
prompting or otherwise. This is very disruptive to terminal sessions to
those devices, especially when uploading firmware or typing commands
that need to be correct to avoid bricking the device.]
"""
cwi...@applicati:/dev$ sudo picocom -b 115200 ./serial/by-id/usb-Das_U-B*
picocom v1.4
port is : ./serial/by-id/usb-Das_U-Boot_U-Boot_2009.01-dirty_0000000-if00
flowcontrol : none
baudrate is : 115200
parity is : none
databits are : 8
escape is : C-a
noinit is : no
noreset is : no
nolock is : no
send_cmd is : ascii_xfr -s -v -l10
receive_cmd is : rz -vv
Terminal ready
AT+GCAP
Unknown command 'AT+GCAP' - try 'help'
OMAP3 beagleboard.org # OAT+GCAP
Unknown command 'AT+GCAP' - try 'help'
OMAP3 beagleboard.org #
"""
The AT+GCAP lines above weren't typed by me, but by another process
(modemmanager) sending commands to the port. They showed up here
because the beagleboard boot loader echoes characters back. The other
process continues to send control characters continually which don't
disrupt single keystrokes, but which garble lines being pasted or or
otherwise transferred to the remote. This has already soft-bricked one
of my beagleboards.
ProblemType: Bug
Architecture: i386
Date: Sun Nov 29 22:20:16 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: modemmanager 0.2.git.20091014t233208.16f3e00-0ubuntu1
ProcEnviron:
SHELL=/bin/bash
LANG=en_CA.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14bfsbfq1.48-generic
SourcePackage: modemmanager
Uname: Linux 2.6.31-14bfsbfq1-generic i686
** Affects: modemmanager (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386
--
/sbin/modemmanager is too aggressive managing devices that aren't known to be
modems
https://bugs.launchpad.net/bugs/490194
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