MC8805 low power mode on Linux after start?

IoT Modules MC/EM Series
1

Hi,

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:

at!pcinfo show:

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.

2

Just to add the link to your post on Dell forum.
http://en.community.dell.com/support-forums/laptop/f/3518/t/19538429.aspx

3

I am facing the same problem.

Could you please let us know the necessary information to power up the
radio in the MC8805?

The MC8805 is listed as supported under Linux after all:
sierrawireless.com/en/produc … dules.ashx

Thank you very much in advance.

4

I’m having the same problem here. The module seems to work alright in win7 but in linux (kernel version 2.6.32) AT+CFUN is 0, and AT+CFUN=1 always return ERROR. Has updated the firmware to SWI9X15C_01.12.00.00, problem is still not resolved.