Description of problem: When attaching an Arduino device, in this case an Arduino Uno, modem-manager tries to open the ttyACM0 device and fails. The Arduino board notices this and it seems that the probes by modem-manager slow down the execution of the code uploaded to the Arduino board. Version-Release number of selected component (if applicable): ModemManager-0.6.0.0-1.fc17 The Ubuntu patches, which apparently have not been upstreamed, are here: https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/910736
Confirming the same on Arduini Leonardo, when modem-manager is off $cat /usr/share/dbus-1/system-services/org.freedesktop.ModemManager.service [D-BUS Service] Name=org.freedesktop.ModemManager #Exec=/usr/sbin/modem-manager Exec=/bin/false User=root Arduino UI seems to send sketches to the device, otherwise I get "Couldn't find a Leonardo on the selected port" messages
adding # Arduino ATTR{idVendor}=="2341", ENV{ID_MM_DEVICE_IGNORE}="1" to /usr/lib/udev/rules.d/77-mm-usb-device-blacklist.rules at list fixes the problem also for Arduino devices, I don't think it will work for clones.
ModemManager-0.6.0.0-3.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/ModemManager-0.6.0.0-3.fc17
ModemManager-0.6.0.0-3.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/ModemManager-0.6.0.0-3.fc18
Package ModemManager-0.6.0.0-3.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing ModemManager-0.6.0.0-3.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-1670/ModemManager-0.6.0.0-3.fc18 then log in and leave karma (feedback).
ModemManager-0.6.0.0-3.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
ModemManager-0.6.0.0-3.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.