柏忠毅的 'the Daily Biff' - Ubuntu Tech Tip: Fixing Camera "could not claim usb device" Errors

Currently playing on my computer (tune in: pls, asx)

Tue, 28 Apr 2009

Ubuntu Tech Tip: Fixing Camera "could not claim usb device" Errors
Once in a great while when I connect my camera to my Ubuntu desktop, I'll get an error code "could not claim the usb device". Usually I bypass this annoyance by logging out and logging back in again, but today I decided to google around and I found a fix.

The first step to fix the problem is to find out the hexadecimal vendor ID and hexadecimal product ID of the camera. To get these, type lsusb at the command prompt, like so:


% lsusb

Bus 007 Device 013: ID 04a9:3113 Canon, Inc.

The vendor and device IDs are shown in red above and are delimited with a colon; the vendor ID is the first hexadecimal number and the product ID is the second hexadecimal number. Now open up the file /etc/udev/rules.d/40-permissions.rules and find the USB device section. This section will be demarcated with "usb_serial_start" and "usb_serial_end" lines and look something like this:

# USB serial converters
# USB serial converters
SUBSYSTEM=="usb_device", GOTO="usb_serial_start"
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", GOTO="usb_serial_start"
GOTO="usb_serial_end"
LABEL="usb_serial_start"
ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", \
                                        MODE="0660", GROUP="dialout"
LABEL="usb_serial_end"

Just before the "usb_serial_end" line, add the following:

ATTRS{idVendor}=="vendor_id", ATTRS{idProduct}=="product_id", \
                                        MODE="0666", GROUP="plugdev"

In my case vendor_id is '04a9' and product_id is '3113'.

It's all better now... sweet!

(Update Tue May 5 09:26:20 PDT 2009 // fixed html validation errors... oops)

:: Posted by rus on Tue, 28 Apr 2009 11:51 pm
:: Filed under /tech

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