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Old 12th December 2011, 04:01 AM
marko Offline
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Join Date: Jun 2004
Location: Laurel, MD USA
Posts: 7,087
Why is the /dev/ttyUSB0 (modem) locked?

I've added the groups "dialout" and "lock" to my normal user, but when I try to dial the modem to send a fax, Fedora 16 insists that the device is locked. But looking in /var/lock/lockdev shows no lock and
the ownership of /dev/ttyUSB0 is:
ls -l /dev/ttyUSB0

crw-rw----, 1 root dialout 188, 0 dec 11 22:49 /dev/ttyUSB0
since the ttyUSB0 is read writeable to the dialout group and my user is in that group, why can't
I unlock and use the modem?

this confirms I have the dialout and lock groups:

id -a mos
uid=1000(mos) gid=1000(mos) groups=1000(mos),10(wheel),54(lock),18(dialout)
Note that I have also added the "mos" user to the mgetty-sendfax "fax.allow" file
and the ttyUSB0 is a Prolific PL2303 usb to serial adapter which connects the Fedora 16 usb port to the USR external modem's serial port. The fax can send ok as root.

Last edited by marko; 12th December 2011 at 05:11 AM. Reason: added lock group
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Old 12th December 2011, 04:44 AM
fdrake Offline
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Join Date: Dec 2011
Posts: 47
Re: Why is the /dev/ttyUSB0 (modem) locked?

nevermind.... i missed 1 group name while reading..

do you have any entry in "/etc/tmpfiles.d/lockdev.conf" ?

Last edited by fdrake; 12th December 2011 at 05:05 AM.
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Old 12th December 2011, 05:09 AM
marko Offline
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Join Date: Jun 2004
Location: Laurel, MD USA
Posts: 7,087
Re: Why is the /dev/ttyUSB0 (modem) locked?

I don't even have that file, should it exist?

Anyway, I've been retrying my efax-gtk that I built from source and it seems to work well enough (the problems I had in the original post were trying to fax
using 'sendfax' command line directly) that I'll go with it. I suspect efax-gtk handles the device more correctly than sendfax.


Last edited by marko; 12th December 2011 at 04:07 PM.
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locked, modem, or dev or ttyusb0

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