im fighting with run this modem (called Dell Wireless 5570) under linux (Ubuntu 12.04), Kernel 3.11.7 with small modification - added ID product ID and vendor ID to the sierra.c driver and now i see the ttyUSB* devices corectly. But.
Modem starts in low power mode (forced by BIOS?) - flag triggered to 1:
State: LowPowerMode LPM force flags - W_DISABLE:0, User:0, Temp:0, Volt:0 LPM force flags - BIOS:1, GOBIIM:0, IM_AttachDelay:0 W_DISABLE: 0 Poweroff mode: 0 LPM Persistent: 0
but i have on the same laptop Windows 7 - and when i first boot windows 7 system and do soft reboot and boot linux again the modem works:
State: Online LPM force flags - W_DISABLE:0, User:0, Temp:0, Volt:0 LPM force flags - BIOS:0, GOBIIM:0, IM_AttachDelay:0 W_DISABLE: 0 Poweroff mode: 0 LPM Persistent: 0
So i think that windows driver sends some command/signal to modem for wake up? What it can be?
When the modem is in LowPowerMode when im trying to mage AT+CFUN=1 gives me error.
My laptop is Dell E7240. I have two latptops with this cards and problem is the same.