View source for Serial adapters/Linux/ModemManager

Some hosts, including XOs with recent OLPC OS builds, include a USB modem detector, ''modemmanager'', which opens any newly plugged adapter, configures it for 57600 baud, and transmits AT commands to elicit a response from a modem.  This may interfere with use of a serial adapter.  There are several workarounds:
*wait out the delay, and connect the coloured serial cable after starting screen,
*remove the ModemManager package, permanently preventing probe of USB modems, type this:
:<pre>sudo rpm -e ModemManager && sudo killall modemmanager</pre>
*add udev rules to exclude the adapter, add this to {{Code|/etc/udev/rules.d/01-local}}:
:<pre>ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ENV{ID_MM_DEVICE_IGNORE}="1"</pre>