Recent (last 2 weeks) ModemManager and Kernel updates break USB Pantech UML290 Verizon broadband modem in Fedora 23

asked 2016-04-11 20:17:38 -0500

updated 2016-04-12 10:37:18 -0500

sergiomb gravatar image

My Verizon USB modem has worked flawlessly in the last few versions of Fedora, including with Fedora 23 until the most recent update for ModemManager and accompanying kernel in late March/early April 2016. Now the modem does not ever initialize. Instead, it re-attempts initialization forever and generates the following syslog entries:

Apr 11 21:10:36 odin.jacksonferry kernel: usb 2-2: new high-speed USB device number 35 using xhci_hcd
Apr 11 21:10:36 odin.jacksonferry kernel: usb 2-2: New USB device found, idVendor=106c, idProduct=3718
Apr 11 21:10:36 odin.jacksonferry kernel: usb 2-2: New USB device strings: Mfr=3, Product=2, SerialNumber=0
Apr 11 21:10:36 odin.jacksonferry kernel: usb 2-2: Product: PANTECH UML290
Apr 11 21:10:36 odin.jacksonferry kernel: usb 2-2: Manufacturer: Pantech, Incorporated
Apr 11 21:10:36 odin.jacksonferry kernel: cdc_acm 2-2:1.0: ttyACM0: USB ACM device
Apr 11 21:10:36 odin.jacksonferry kernel: qcaux 2-2:1.2: qcaux converter detected
Apr 11 21:10:36 odin.jacksonferry kernel: usb 2-2: qcaux converter now attached to ttyUSB0
Apr 11 21:10:36 odin.jacksonferry kernel: qcaux 2-2:1.3: qcaux converter detected
Apr 11 21:10:36 odin.jacksonferry kernel: usb 2-2: qcaux converter now attached to ttyUSB1
Apr 11 21:10:36 odin.jacksonferry kernel: qcaux 2-2:1.4: qcaux converter detected
Apr 11 21:10:36 odin.jacksonferry kernel: usb 2-2: qcaux converter now attached to ttyUSB2
Apr 11 21:10:36 odin.jacksonferry kernel: qmi_wwan 2-2:1.5: cdc-wdm0: USB WDM device
Apr 11 21:10:36 odin.jacksonferry kernel: qmi_wwan 2-2:1.5 wwan0: register 'qmi_wwan' at usb-0000:00:14.0-2, WWAN/QMI device, 1a:a4:bc:f7:32:17
Apr 11 21:10:36 odin.jacksonferry mtp-probe[6127]: checking bus 2, device 35: "/sys/devices/pci0000:00/0000:00:14.0/usb2/2-2"
Apr 11 21:10:36 odin.jacksonferry mtp-probe[6127]: bus: 2, device: 35 was not an MTP device
Apr 11 21:10:36 odin.jacksonferry ModemManager[1113]: [/dev/cdc-wdm0] Opening device with flags 'version-info, proxy'...
Apr 11 21:10:36 odin.jacksonferry ModemManager[1113]: [/dev/cdc-wdm0] Checking version info (10 retries)...
Apr 11 21:10:36 odin.jacksonferry kernel: qmi_wwan 2-2:1.5 wwp0s20u2i5: renamed from wwan0
Apr 11 21:10:36 odin.jacksonferry ModemManager[1113]: <warn>  (ttyUSB1): port attributes not fully set
Apr 11 21:10:36 odin.jacksonferry ModemManager[1113]: <warn>  (ttyUSB2): port attributes not fully set
Apr 11 21:10:36 odin.jacksonferry ModemManager[1113]: <warn>  (ttyUSB0): port attributes not fully set
Apr 11 21:10:40 odin.jacksonferry ModemManager[1113]: [/dev/cdc-wdm0] QMI Device supports 8 services:
Apr 11 21:10:40 odin.jacksonferry ModemManager[1113]: [/dev/cdc-wdm0]    ctl (1.4)
Apr 11 21:10:40 odin.jacksonferry ModemManager[1113]: [/dev/cdc-wdm0]    wds (1.10)
Apr 11 21:10:40 odin.jacksonferry ModemManager[1113]: [/dev/cdc-wdm0]    dms (1.3)
Apr 11 21:10:40 odin.jacksonferry ModemManager[1113]: [/dev/cdc-wdm0]    nas (1.2)
Apr ...
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