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Old 02-11-2019, 09:23 AM   #1
Rosika
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turning on/off usb-device with command (usb-hub)


Hi,

I know this topic has been dealt with before but my "problem" is a bit different.

I want to enable/disable specific usb-ports. The theory is clear as it is well described on https://stackoverflow.com/questions/...b-device-again . Example:
Code:
Turn off device ID 2-1:

echo '2-1' |sudo tee /sys/bus/usb/drivers/usb/unbind
In my case itīs the following I want to do:

disabling the usb-port my wlan-stick is attached to.
Thatīs because I donīt need it when I use my umts-stick for internet-connection.

BUT: The wlan-stick isnīt attached directly to a usb-port on the computer but to a usb-hub which itself is connected to another
usb-hub (hama 78483) with its own power-supply
.

So when using the recommended command, in my case:

Code:
echo '1-1.2.1' |sudo tee /sys/bus/usb/drivers/usb/unbind
whould that have any effect at all? Because the hama hub with its own power-supply delivers power all the time, right?
Is there possibly another way of disabling a certain usb-device that suits my needs?

Many thanks in advance

Greetings
Rosika

P.S.:
My system: Linux/Lubuntu 16.04.5 LTS, 64 bit
 
Old 02-11-2019, 09:44 AM   #2
pan64
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why don't you try it?
From the other hand you need to disable that wlan which is probably easier.
 
Old 02-11-2019, 09:52 AM   #3
Rosika
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Hi pan64,

tnx for your fast reply.

I was hoping to find out what bind/unbind in this context exactly does. Does it switch on/off power or does it do something else.......?

Quote:
From the other hand you need to disable that wlan which is probably easier.
Iīm not quite sure what you mean by that. How do I go about it?
 
Old 02-11-2019, 10:19 AM   #4
pan64
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here it is described: http://www.upubuntu.com/2012/01/how-...k-adapter.html. But probably I misunderstood something
 
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Old 02-11-2019, 10:34 AM   #5
Rosika
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Hello again and thanks a lot,

yes, the link you provided seems to present a solution to my "problem". I think Iīll go for that one.

But out of curiosity:
Iīd still like to know what bind/unbind mean. Iīve been looking all over the web but havenīt been able to find a satisfactory answer to that.
 
Old 02-11-2019, 10:55 AM   #6
pan64
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I can only guess, it will virtually detach that port. That means it will not be available any more, but will not be switched off. Just the kernel will not know about that and will not be able to detect(and use) any device plugged in.
 
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Old 02-11-2019, 11:07 AM   #7
Rosika
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O.K., that makes sense. Thank you for clarifying that.
And tnx for all the effort of yours.

Greetings
Rosika
 
Old 02-12-2019, 02:25 AM   #8
pan64
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glad to help you
 
  


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