Hi, Thanks for the reply. Yes CONFIG_PM_RUNTIME and CONFIG_USB_SUSPEND are chosen. I wrote a sample program using libusb. I am closing the device handler and setting the files in PM folder (/sys/bus/usb/devices/2-2/power/control and autosuspend_delay_us). Is it enough to make the device auto suspended. Thanks, Viswandh -----Original Message----- From: Chen Peter-B29397 [mailto:B29397@xxxxxxxxxxxxx] Sent: Wednesday, June 20, 2012 11:21 AM To: Viswanadha Palepu; linux-usb@xxxxxxxxxxxxxxx Subject: RE: How to selective suspend usb on linux > > Hi > I tried usb selective suspend on kernels 2.6.32 and 2.6.35 using the > /sys/bus/usb/devices/x-x/power/level and autosuspend. > > But on 2.6.35 its not working, even I changed the level to control and > autosuspend to autosuspend_us_delay. > Is there any other way to selective suspend usb 2.0? > I remembered the autosuspend should be OK at 2.6.35, you only need to do below command to auto suspend your device. echo auto > /sys/bus/usb/devices/x-x/power/control Please make sure CONFIG_PM_RUNTIME and CONFIG_USB_SUSPEND are chosen. > > -- > 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 -- 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
