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Old 07-25-2006, 06:37 AM   #1
Registered: May 2006
Distribution: Ubuntu10.04, < fedora12
Posts: 347

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FC5 usb camera problem

When I connect camera to usb I get the camera coonect dialog box up OK, when I click on download images I get this fault message.
"An error has accured in the io-library (could not claim the usb device) Cound not claim interface 0 (operation not permitted). Make sure no other program or kernel module (such as sdc2xx, stv680, spca680, spca50x is using the device and you have read/write access to the device."

I'd just booted up so didn't think anything else would be running, so logged in as graphical root, and it worked fine, Logged back in as user and got the same error message.
So it seems I have to change the permissions on interface 0. Had a look around where I thought it might be, but all I found was /dev/bus/usb, this has 2 folders named 1 & 2,
all that's inside them is a small image with today's date. Permissions are root read & write. Is it worth trying to change these? I have a gut feeling it isn't

The same hardware works fine with core3/4

Any ideas anybody? All thoughts welcome, especially if they help me fix this!

Old 08-10-2006, 08:59 AM   #2
Registered: Jun 2005
Location: Lilburn, Ga
Distribution: FC5
Posts: 175

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Maybe this will help. I can't recall the details, (sorry) but in
/etc/udev/rules.d you will find where all this is et up. Perhaps in the one that begins with "50". Look for your devices, and there's a way to set how the permissions start when a usb device appears.
Old 08-11-2006, 08:21 AM   #3
Registered: May 2006
Distribution: Ubuntu10.04, < fedora12
Posts: 347

Original Poster
Rep: Reputation: 34
Thanks for that,
You're right the usb permissions are there. I tried changing them from "0660" to "0666" and then "0777" but unfortunately didn't make any difference. I'll have a bit more of a look at the udev man page and see if I can come up with anything


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