Samsung galaxy tab 7.0
Ubuntu 11.04
udev rules are ok.
debugging on device enabled.
Problem: command "adb devices" prints device serial ID as "???????????" (lot of question signs) and device status "offline", which sometimes becomes "device".
Anyway, running android project from eclise is impossibru because it sees device as "??????????".
Sometimes all becomes OK after rebooting, but now it completely broken and rebooting doesn't help.
I have no idea how to solve this problem...
The problem was in the bad cable.