Serial adapters/Linux/ModemManager: Difference between revisions
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Some hosts |
Some hosts 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: |
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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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*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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Affected hosts include: |
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*XOs with recent OLPC OS builds, |
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*Ubuntu, |
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*Debian. |
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Latest revision as of 21:20, 14 January 2014
Some hosts 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"
Affected hosts include:
- XOs with recent OLPC OS builds,
- Ubuntu,
- Debian.