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Old 12-11-2006, 05:53 AM   #1
michaeljensen
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Power off USB


Does anybody know how to power off the individual usb ports? Like on windows. I would like to power on / off usb mounted disks.
 
Old 12-12-2006, 12:19 AM   #2
macemoneta
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Well, I don't have anything that I can test with at the moment, but it looks to me that if you find your device with

lsusb -v | less

You should be able to power it off with:

echo "0" > /sys/bus/usb/devices/device/power/state

For example:

echo "0" > /sys/bus/usb/devices/6-0:1.0/power/state

Why don't you try it and let us know?
 
Old 01-01-2007, 03:43 AM   #3
mjrclark
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$:/sys/bus/usb/devices/6-1/power$ echo "0" > /sys/bus/usb/devices/6-0:1.0/power/state
bash: /sys/bus/usb/devices/6-0:1.0/power/state: Permission denied

Even with all combinations of sudo. It seems this attribute is read only, I have not seen this "permission denied" anywhere else.
Discussion continues in other thread, the one I started.
http://www.linuxquestions.org/questi....php?p=2565927
Edit-Clarification
I am not the original poster, and I was trying to use these commands to do something slightly different- power down usb ports, that have various peripherals attached. This turned out to be impossible to do.

Last edited by mjrclark; 01-02-2007 at 04:49 AM.
 
Old 01-01-2007, 03:49 PM   #4
galle
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Couldn't you just use hdparm to power down the disks?
 
Old 07-01-2008, 05:27 PM   #5
Hobart
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Lightbulb

Quote:
Originally Posted by mjrclark View Post
$:/sys/bus/usb/devices/6-1/power$ echo "0" > /sys/bus/usb/devices/6-0:1.0/power/state
bash: /sys/bus/usb/devices/6-0:1.0/power/state: Permission denied

Even with all combinations of sudo. It seems this attribute is read only, I have not seen this "permission denied" anywhere else.
Discussion continues in other thread, the one I started.

Edit-Clarification
I am not the original poster, and I was trying to use these commands to do something slightly different- power down usb ports, that have various peripherals attached. This turned out to be impossible to do.
You may have to do "echo -n 0 > file" instead of "echo 0 > file".

Cheers,
-jon
 
  


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