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.
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 bugged)? If someone can help me with these questions, I can continue to investigate this issue. Thanks. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/875801 Title: Linux power regeression is not improved from Natty to Oneiric to Precise - Netbook Zareason Terra HD To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/875801/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
