LinuxQuestions.org - USB Device Voltage cut off

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USB Device Voltage cut off

Hello,

I'm using RHEL5 and checking USB devices. Now what I'm trying is to cut off (turn off) the voltage supplied to USB device.

Quote:

# uname -r
2.6.29.6.99.custom.22122009
# cd /sys/bus/usb/devices/2-1/power
# ls
active_duration autosuspend connected_duration level wakeup
# echo "suspend" > level

But, it's not possible to turn off the power of USB devices, although e.g. only iPod was released from the USB device by this commands.

Is there a ways to directly turn off the voltage of USB dev on linux?

thanks in advance.
Gen

you have to Mount the Pen Drive.Then You have to Apply ACPI Command For it.But You have to Mount it First then You can apply this Command.