Prevent Ubuntu (12.10+) modem-manager from keeping your Sheevaplug busy

As of Ubuntu 12.10 the very helpful modem-manager will try to connect to about any serial device. Unfortunately that means that when you connect a Marvell Sheevaplug it will connect to that as well, resulting in device or resource busy error when trying to open a screen session to your Sheevaplug. However, the solution is fairly easy, just add the following to /etc/udev/rules.d/70-mm-no-sheevaplug.rules:

ACTION!="add|change", GOTO="mm_usb_device_blacklist_end"
SUBSYSTEM!="usb", GOTO="mm_usb_device_blacklist_end"
ENV{DEVTYPE}!="usb_device",  GOTO="mm_usb_device_blacklist_end"

# Marvell Sheevaplug
ATTRS{idVendor}=="9e88", ATTRS{idProduct}=="9e8f", ENV{ID_MM_DEVICE_IGNORE}="1"

LABEL="mm_usb_device_blacklist_end"

Now do a simple sudo service udev reload, and enjoy your screen sessions with the Sheevaplug again!