
Comment 1 by Radek Polak, Aug 28, 2013
For more details it was described e.g. here: http://lists.goldelico.com/pipermail/gta04-owner/2012-February/001563 .html If you want to easily reproduce you can e.g. use N900 as your second phone and write shell script for the dialing.

Comment 3 by Radek Polak, Aug 28, 2013
Small workaround is to put modem in 2G only, then the reenumeration should not occur that much. The AT command is: AT_OPSYS=0,2

Comment 4 by Nikolaus Schaller, Aug 28, 2013
There are several hypotheses what the reasons are: 1. modem firmware bug 2. linux kernel (general USB) / driver (HSO) 3. hardware 4. user space triggered (which I think is the least probable) We finally have to find out what the real reason is - and/or develop better work-arounds.

Comment 5 by Radek Polak, Aug 30, 2013
Attached is log from my phone. You can seach for string "Globetrotter" for reenumerates. The line "Hiding non-modal dialog: PhoneMessageBox" is for each call. At the end of log modem disconnects from USB and never connects back. Even after reboot there are no /dev/ttyHS ports and lsusb does not show the modem. After removing battery and booting again the modem is working again
- messages - 333.97 kB

Comment 6 by Radek Polak, Aug 30, 2013
Btw the log is taken with these modem settings: AT_OPSYS? _OPSYS: 3,2

Comment 7 by Radek Polak, Sep 4, 2013
Just for the record here are some interesting mails about the problem: http://lists.goldelico.com/pipermail/gta04-owner/2013-September/00493 3.html http://lists.goldelico.com/pipermail/gta04-owner/2013-September/00493 9.html

Comment 8 by Nikolaus Schaller, Sep 7, 2013
And another trick for testing the test code (which is important to know): ./femtocom /dev/ttyHS_Control AT_ORESET This will reset the modem and it will loose the USB connection and re-enumerate like this dmesg shows: [ 6940.011840] usb 1-2: USB disconnect, device number 5 [ 6945.105041] usb 1-2: new high-speed USB device number 6 using ehci-omap [ 6945.286895] usb 1-2: New USB device found, idVendor=0af0, idProduct=8800 [ 6945.300415] usb 1-2: New USB device strings: Mfr=3, Product=2, SerialNumber=0 [ 6945.323791] usb 1-2: Product: Globetrotter HSUPA Modem [ 6945.329132] usb 1-2: Manufacturer: Option N.V. As a side note: the modem accepts more at commands after AT_ORESET for ca. 1-2 seconds like this sequence shows: root@gta04:~# ./femtocom /dev/ttyHS_Control at_oreset OK ati Manufacturer: Option N.V. Model: GTM601 Revision: 1.7.4.0 (Date: Jan 5 2011, Time: 11:14:34) OK ati Manufacturer: Option N.V. Model: GTM601 Revision: 1.7.4.0 (Date: Jan 5 2011, Time: 11:14:34) OK ati ati <--- tty port hangs (w/o error message!) ati ati ati ati ^C root@gta04:~# So in general the re-enumeration shares the symptoms of an AT_ORESET.
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Reported by Radek Polak, Aug 28, 2013