check the manual http://www.quantum-espresso.org/wp-content/uploads/Doc/INPUT_PW.html#idm580 'vdw_corr' in case you go for local correction or check 'input_dft' and specify a non-local functional and don't forget to build the kernel. You can find the functionals available commented in the source code, Modules/funct.f90
as phonon calculations can be extensive and you are testing the waters, I suggest to use vdw_corr combined with PBE functionals then you can later use the non-local functioanls, maybe it can be more speedy in your case. Karim Elgammal KTH
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