If I enter Amarok in Terminal, this happens:

X Error: BadDevice, invalid or uninitialized input device 167
  Major opcode:  147
  Minor opcode:  3
  Resource id:  0x0
Failed to open device
X Error: BadDevice, invalid or uninitialized input device 167
  Major opcode:  147
  Minor opcode:  3
  Resource id:  0x0
Failed to open device
Amarok: [Loader] Starting amarokapp..
Amarok: [Loader] Don't run gdb, valgrind, etc. against this binary! Use amarokapp.
amarokapp: error while loading shared libraries: libGL.so.1: cannot open shared object file: No such file or directory

How does this happen?

GreetZ GreebZ

Your Amarok was built with OpenGL support, but apparently your GL library is missing. Try to install OpenGL.