Weird... is this happening for every LTE modem out there?

We could have a new property in MMBroadbandModem specifying that +CSQ is
always preferred over +CIND for signal quality updates (talking about
git master here), so that plugins can set it when that happens.

Or, if the issue is really more generic and happens with most LTE modems
out there, we could force using +CSQ when in LTE.

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https://bugs.launchpad.net/bugs/1060831

Title:
  Sierra/ZTE LTE modem gives no signal quality in LTE mode (only in
  3G/2G mode)

Status in “modemmanager” package in Ubuntu:
  Triaged
Status in “network-manager-applet” package in Ubuntu:
  Invalid

Bug description:
  In LTE mode, the sierra modem (MC7710) gives no indication of signal
  quality in nm-applet. It looks like icon "gsm-3g-none.svg". I suspect
  this is caused by this in the modemmanager debug log when connected:

  modem-manager[25672]: <debug> [1349256755.558392] [mm-at-serial-port.c:334] 
debug_log(): (ttyUSB3): --> 'AT*CNTI=0<CR>'
  modem-manager[25672]: <debug> [1349256755.579056] [mm-at-serial-port.c:334] 
debug_log(): (ttyUSB3): <-- '<CR><LF>*CNTI: 0,LTE<CR><LF><CR><LF>OK<CR><LF>'
  modem-manager[25672]: <debug> [1349256758.802283] [mm-at-serial-port.c:334] 
debug_log(): (ttyUSB3): --> 'AT+CIND?<CR>'
  modem-manager[25672]: <debug> [1349256758.821538] [mm-at-serial-port.c:334] 
debug_log(): (ttyUSB3): <-- '<CR><LF>+CIND: 
5,0,1,1,0,0,1,0<CR><LF><CR><LF>OK<CR><LF>'

  Seems like the signal quality is the second number:

  Oct  1 19:23:39 marius-T1005 ModemManager[22170]: <debug> [1349112219.280233] 
[mm-at-serial-port.c:392] debug_log(): 
  (ttyUSB3): <-- '<CR><LF>+CIND: 
("battchg",(0-5)),("signal",(0-5)),("service",(0-1)),("call",(0-1)),("roam",(0-1)),("s
  msfull",(0-1)),("GPRS 
coverage",(0-1)),("callsetup",(0-3))<CR><LF><CR><LF>OK<CR><LF>'
  Oct  1 19:23:39 marius-T1005 ModemManager[22170]: <debug> [1349112219.280871] 
[mm-broadband-modem.c:1704] cind_format
  _check_ready(): Modem supports signal quality indications via CIND at index 
'2'(min: 0, max: 5)

  which is reported as zero. The signal is good (I measure download rate
  of 37 mbits/s), and in 3G/2G mode I get the correct signal quality
  indication.

  Could it be that MM should not use +CIND but instead +CSQ?

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: network-manager-gnome 0.9.6.2-0ubuntu5
  Uname: Linux 3.6.0-030600rc6-generic i686
  ApportVersion: 2.6.1-0ubuntu1
  Architecture: i386
  Date: Wed Oct  3 11:19:55 2012
  EcryptfsInUse: Yes
  IpRoute:
   default via 89.9.192.92 dev wwan0  proto static
   89.9.192.0/24 dev wwan0  proto kernel  scope link  src 89.9.192.92  metric 7
   169.254.0.0/16 dev wwan0  scope link  metric 1000
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=false
   WWANEnabled=true
   WimaxEnabled=true
  ProcEnviron:
   LANGUAGE=nb_NO:nb:no_NO:no:nn_NO:nn:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=nb_NO.UTF-8
   SHELL=/bin/bash
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: yes
    Hard blocked: no
  SourcePackage: network-manager-applet
  UpgradeStatus: Upgraded to quantal on 2012-08-31 (32 days ago)
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH
   wwan0      gsm               connected     
/org/freedesktop/NetworkManager/Devices/2
   eth0       802-3-ethernet    unavailable   
/org/freedesktop/NetworkManager/Devices/1
   wlan0      802-11-wireless   unavailable   
/org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   
WIFI       WWAN-HARDWARE   WWAN
   running         0.9.7.0    connected       enabled       enabled         
disabled   enabled         enabled

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