Serial adapters/Linux/ModemManager: Difference between revisions
Jump to navigation
Jump to search
(Created page with '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 tra…') |
No edit summary |
||
| (2 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
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: |
||
*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, |
||
*remove the ModemManager package, permanently preventing probe of USB modems, type this: |
*remove the ModemManager package, permanently preventing probe of USB modems, type this: |
||
:<pre>sudo rpm -e ModemManager</pre> |
:<pre>sudo rpm -e ModemManager && sudo killall modem-manager</pre> |
||
*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}}: |
||
:<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> |
||
Affected hosts include: |
|||
*XOs with recent OLPC OS builds, |
|||
*Ubuntu, |
|||
*Debian. |
|||
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.