--- Comment #3 from stiu@... 2012-07-28 00:30:14 ---
I'm investigating the issue.
Changing the /sys/bus/usb/devices/usb4/4-1/power/control from "on" to "auto",
have the right effect to auto-suspend the HDSPA modem. This will save about 500
mW. More investigations revealed that in Ubuntu 12.04, this device has the
maximum power usage setted to 500mW (found with the command "lsusb -v", at the
line "MaxPower"). So suspending this device has less effect on power
consumption compared to previous version of Ubuntu (~ 1W).
This mean that there is something else that had raised its power usage. (this
can be related only to Ubuntu and not Linux)
However, the changes at the file /sys/bus/usb/devices/usb4/4-1/power/control
will reset at the next reboot of the netbook.
1) So, how can I make that changes be permanent?
2) If these are not permanent, this means that some other process at the boot
will automatically check the devices and will sets the power properties to
them. Can someone tell me which process do this control (because is obviously
If someone can help me with these questions, I can continue to investigate this
(P.S. Kernel 3.5 also have this issue)
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