When I write lsusb -v I always get "Couldn't open device, some information will be missing" Is this normal to get for each bus?

P.S: I was trying to read from a laser scanner which is connected via USB. But I was getting "couldn't open serial port". And I wanted to check the port with lsusb and I saw that it's written "Couldn't open device" on every one of these usb ports. Even for my mouse it says "Couldn't open" but it's working.

3

1 Answer

Yes it is. You are asking for hardware information so some information might need sudo. See the difference between the 2 ...

rinzwind@schijfwereld:~$ lsusb -v | grep device
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing

and when using sudo it disappears though you will get other notices:

rinzwind@schijfwereld:~$ sudo lsusb -v | grep device
can't get debug descriptor: Resource temporarily unavailable Lowest fully-functional device speed is SuperSpeed (5Gbps)
can't get debug descriptor: Resource temporarily unavailable
Device Qualifier (for other device speed):
can't get device qualifier: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable
can't get device qualifier: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable

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