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Old 07-15-2005, 02:26 AM   #1
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Registered: Jul 2005
Posts: 17

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What is a "string identifier" and how do I set it

(I'm a newbie, by the way, so please be patient and explain in simple terms)

I have been fighting for days to get my Wacom tablet to be installed properly on Fedora Core 4.

By following the instructions on, I've managed to get the wacom drivers installed and the configuration installed. Here is some outputs to show where I'm at:
#ls -l /dev/input/wacom
lrwxrwxrwx 1 root root 6 Jul 15 2005 /dev/input/wacom -> event2
(In a new window)
We didn't find any Wacom device.
Please make sure the device's
type (stylus, eraser, or cursor)
is embeded into its identifier string

So the configuration program is installed, and so is my wacom, but the configuration program can't find the tablet because the "device type" is not "embedded" into its "identifier string".

So how can I embed the device type into the identifier string so that the config file will find the tablet?

Just for reference, here's what I have in my xorg.conf

Section "InputDevice"
Driver "wacom"
Identifier "cursor"
Option "Device" "/dev/input/event2"
Option "Type" "cursor"
Option "USB" "on"

Section "InputDevice"
Driver "wacom"
Identifier "stylus"
Option "Mode" "relative"
Option "Device" "/dev/input/event2"
Option "Type" "stylus"
Option "USB" "on"

Section "InputDevice"
Driver "wacom"
Identifier "eraser"
Option "Device" "/dev/input/event2"
Option "Type" "eraser"
Option "USB" "on"

Thank you for any assistance.
Old 07-15-2005, 05:11 PM   #2
Senior Member
Registered: Jul 2004
Distribution: Ubuntu 7.04
Posts: 1,991

Rep: Reputation: 76
Re: What is a "string identifier" and how do I set it

An identifier string is a string reported from a (usually USB) device to tell the operating system what kind of device it is. (This is the basis for a device identification system called Plug & Play).

Firstly, what kind of graphics tablet do you actually have? Is it actually listed as supported on the web-site you posted? Can you see it listed anywhere under /proc/pci or /proc/bus/usb/devices?

Usually, if a device is supported then it will be identified. Very few, if any, devices allow you to configure their identification string; it's normally hard-coded into a ROM built into the USB (or other bus) controller chip. You'll need a soldering iron, some solder, a desoldering tool, an anti-static wristband, something to use as a heat-shunt (long-nosed pliers can work well, but this really depends on the thermal properties of the chip), and a suitable kind of programmer (the type depending on the chip).

To be honest, you're better off looking for a way to override the identifier for the device, assuming that it is actually supported. You can normally do this with command-line options; see the documentation for the driver.

Last edited by rjlee; 07-15-2005 at 05:13 PM.


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