Red Hat Bugzilla – Bug 558701
Novatel Wireless USB760 modem not available for connections by default
Last modified: 2011-06-27 10:51:11 EDT
Description of problem:
Novatel USB760 is a broadband 3G/EVDO modem and mass storage device containing Windows/Mac drivers. With a fully updated Fedora system, user steps are required to enable modem usage. However, if a user ejects the storage device, the modem becomes available. If usb_modeswitch is installed, and the configuration enabled, executing usb_modeswitch also makes the modem available.
Version-Release number of selected component (if applicable):
Fedora 12 184.108.40.206-174.2.3.fc12.i386.PAE
Steps to Reproduce:
1. Install Fedora 12
2. Update all packages
3. Plug in a Novatel Wireless USB760 modem
4. View /var/log/messages, a "VZAccess Manager" icon appears on the desktop
5. Modem is not available
I have found that two methods make this modem available:
Method #1: eject
Eject the storage device through software (not physically), and the modem can be used by dialers (including NetworkManager).
As discussed in Bug 475914 Comments 6/7 say: a udev rule is created and can then be modified to automatically eject the device. Edit the following file after inserting the USB760 at least once:
Add to any line containing "Novatel_Mass_Storage" at the end:
Remove USB760 and reboot, now when inserting the USB760, it is automatically entered into modem mode after ejecting.
Method #2: usb_modeswitch
As mentioned in Bug 475914 Comment 24, usb_modeswitch can handle this device. However, it must be configured first:
1. Install the package "usb_modeswitch"
2. Edit /etc/usb_modeswitch.conf"
3. Remove the comments around all of the lines in the "Novatel U760 USB Modem" section:
4. Run the command as root: "/usr/bin/usb_modeswitch"
The modem is now available to dialers (including NetworkManager), along with the mass storage device.
5. To automate this, edit the line as mentioned for Method #1, but instead of appending "eject", append:
The "eject" method is easiest for users, but may not be obvious at first. There is no Linux software needed on the storage device, but the pdf can be accessed.
The "usb_modeswitch" seems to be the more appropriate approach. However, there are extra steps involved that could be tweaked to provide a better user experience. If usb_modeswitch was part of a standard install, and the devices available without text file editing, this device would work out of the box. I mention this because I only find one other bug related to this device, but many, many posts online about trying to get this to work. I was surprised that a fully updated Fedora 12 didn't work out of the box.
Also, this is a "Novatel Wireless USB760 Qualcomm 3G CDMA" on Verizon.
If using NetworkManager and the modem is not showing up, right-click NetworkManager icon, select "Edit Connections", under "Mobile Broadband" click "Add" and if the modem is not detected there, then it has not been made available through eject/usb_modeswitch methods. I never had to restart NetworkManager or the system.
This is still a problem in F13.
How can Fedora ship with automagical support for the U760 (and other dual-function storage/modem dongles)?
The eject and usb_modeswitch methods both work, but require root to manually edit files, which is bad.
On a side note, U760 support in F13 is currently broken for other reasons as described in bug 580514 and bug 580709.
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