Samsung Galaxy 7" (GT-P6210) USB debugging is not detecting in Linux? I am using ubuntu Linux 10.04 Pc in that my Samsung Galaxy 7" (GT-P6210) homeycomb 3.2 is not detecting for development its showing in eclipse as

DeviceMonitor] Failed to start monitoring ????????????  in console 

and in device tab its showing ?????????????.

Except this 7' GT-P6210 Samsung tablet all other Samsung devices are showing fine.

When I switch off the tablet and connected to the USB its showing the number and online as status. 
List of devices attached 
4641199B0F8488AE    device

why? whats the problem any solution.

NOTE:
I already Added 51-android.rules 

Samsung 04E8 


and also I enabled the USB debugging mode.

Its working fine in Mac.

I found that only its not detecting in updated ADT r16, except all other ADT version device is detecting very fine.

any idea?
When adb shows devices as ???????????? it's usually a permission problem and the usb device file. Your udev rules doesn't seem right. Make sure that you have udev configured to something like this:

SUBSYSTEM=="usb", SYSFS{idVendor}=="04e8", MODE="0666"


Where 04e8 is Samsung's USB Vendor ID.

Under Linux there is also an adb_usb.ini from the SDK where you have to add the vendor IDs:

~/.android/adb_usb.ini

# ANDROID 3RD PARTY USB VENDOR ID LIST -- DO NOT EDIT.
# USE 'android update adb' TO GENERATE.
# 1 USB VENDOR ID PER LINE.
0x17ef
0x1949