https://bugzilla.kernel.org/show_bug.cgi?id=42690
--- Comment #3 from [email protected] 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 bugged)? If someone can help me with these questions, I can continue to investigate this issue. Thanks. (P.S. Kernel 3.5 also have this issue) -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ acpi-bugzilla mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
