Serial adapters/Linux/ModemManager: Difference between revisions
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*wait out the delay, and connect the coloured serial cable after starting screen, |
*wait out the delay, and connect the coloured serial cable after starting screen, |
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*remove the ModemManager package, permanently preventing probe of USB modems, type this: |
*remove the ModemManager package, permanently preventing probe of USB modems, type this: |
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:<pre>sudo rpm -e ModemManager && sudo killall |
:<pre>sudo rpm -e ModemManager && sudo killall modem-manager</pre> |
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*add udev rules to exclude the adapter, add this to {{Code|/etc/udev/rules.d/01-local}}: |
*add udev rules to exclude the adapter, add this to {{Code|/etc/udev/rules.d/01-local}}: |
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:<pre>ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ENV{ID_MM_DEVICE_IGNORE}="1"</pre> |
:<pre>ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ENV{ID_MM_DEVICE_IGNORE}="1"</pre> |
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Revision as of 10:54, 11 January 2014
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:
sudo rpm -e ModemManager && sudo killall modem-manager
- add udev rules to exclude the adapter, add this to /etc/udev/rules.d/01-local:
ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ENV{ID_MM_DEVICE_IGNORE}="1"