[Bug 1579290] Re: Sierra EM7455 not working usbutils

[David Jao]

After many months, I finally got this modem working in Xenial (Thinkpad
T460s). Install the libqmi 1.16.0, libmbim 1.14.0, and modemmanager
1.6.0 packages from Yakkety Yak, and make sure you're on kernel
4.4.0-36-generic #55. Reboot and everything should Just Work, assuming
your SIM card is indeed usable (test it in Windows to make sure; my
first attempt failed due to SIM issues). I'm posting this through my LTE
connection.

One minor remaining bug is that the signal strength indicator in Network
Manager is not working; it shows zero bars of signal regardless of the
actual signal strength. But I can live with that for now.

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https://bugs.launchpad.net/bugs/1579290

Title:
  Sierra EM7455 not working usbutils

Status in usbutils package in Ubuntu:
  Confirmed

Bug description:
  johnman at johnman-ThinkPad-X1-Carbon-4th:~$ usb-devices

  T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480 MxCh=12
  D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
  P:  Vendor=1d6b ProdID=0002 Rev=04.04
  S:  Manufacturer=Linux 4.4.0-22-generic xhci-hcd
  S:  Product=xHCI Host Controller
  S:  SerialNumber=0000:00:14.0
  C:  #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
  I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub

  T:  Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  2 Spd=480 MxCh= 0
  D:  Ver= 2.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
  P:  Vendor=1199 ProdID=9079 Rev=00.06
  S:  Manufacturer=Sierra Wireless, Incorporated
  S:  Product=Sierra Wireless EM7455 Qualcomm Snapdragon X7 LTE-A
  S:  SerialNumber=LF54844201021013
  C:  #Ifs= 2 Cfg#= 1 Atr=a0 MxPwr=500mA
  /usr/bin/usb-devices: line 79: printf: c: invalid number
  I:  If#= 0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=0e Prot=00 Driver=cdc_mbim
  /usr/bin/usb-devices: line 79: printf: d: invalid number
  I:  If#= 0 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim

  T:  Bus=01 Lev=01 Prnt=01 Port=07 Cnt=02 Dev#=  4 Spd=480 MxCh= 0
  D:  Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs=  1
  P:  Vendor=04f2 ProdID=b531 Rev=00.22
  S:  Manufacturer=Chicony Electronics Co.,Ltd.
  S:  Product=Integrated Camera
  S:  SerialNumber=0001
  C:  #Ifs= 2 Cfg#= 1 Atr=80 MxPwr=500mA
  I:  If#= 0 Alt= 0 #EPs= 1 Cls=0e(video) Sub=01 Prot=00 Driver=uvcvideo
  I:  If#= 1 Alt= 0 #EPs= 0 Cls=0e(video) Sub=02 Prot=00 Driver=uvcvideo

  T:  Bus=01 Lev=01 Prnt=01 Port=08 Cnt=03 Dev#=  5 Spd=12  MxCh= 0
  D:  Ver= 2.00 Cls=ff(vend.) Sub=10 Prot=ff MxPS= 8 #Cfgs=  1
  P:  Vendor=138a ProdID=0090 Rev=01.64
  S:  SerialNumber=c5a380ed1410
  C:  #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
  I:  If#= 0 Alt= 0 #EPs= 5 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)

  T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=5000 MxCh= 6
  D:  Ver= 3.00 Cls=09(hub  ) Sub=00 Prot=03 MxPS= 9 #Cfgs=  1
  P:  Vendor=1d6b ProdID=0003 Rev=04.04
  S:  Manufacturer=Linux 4.4.0-22-generic xhci-hcd
  S:  Product=xHCI Host Controller
  S:  SerialNumber=0000:00:14.0
  C:  #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA
  I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub

  1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
  Description:	Ubuntu 16.04 LTS
  Release:	16.04

  2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
  Version 15.12

  3) What you expected to happen
  Working modem in ubuntu

  4) What happened instead
  Modem is not working somehow.

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