On Sat, 26 May 2012, Anil Nair wrote: > touchscreen and resuming it, the details for that can be found on > Linux kernel source Documentation/usb/power-management.txt > > /sys/bus/usb/devices# echo 2 > 1-2/power/autosuspend > > Here, 1-2 represents the USB bus address for that device which can be > found out by using lsusb. > The number 2 represent the timeout. > > The timeout can be set to any integer number of seconds. If set to -1, > the device will not autosuspend. Then we make sure the kernel will > automatically suspend the device, and resume the device if data needs > to be transferred: > > /sys/bus/usb/devices# echo auto > 1-2/power/level > > Other options to echo to this file are "on" and "suspend": > > "on" will force the device to be on all the time. > "suspend" will permanently suspend the device until the user > echoes "on" or "auto" to this file. > (Note that this is a simplification, since the value of the > power/wakeup file may allow the device to signal a remote wakeup.) This description is quite out of date: The file to use is power/control, not power/level, and there is no "suspend" option. You should read the current version of power-management.txt. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
