Hello,
I am running a vc-relax calculation for a crystal structure, and I'm trying to 
compare the results between PBE and PBEsol. The SCF converges with PBE using 
the default Davidson diagonalization. When I switch to PBEsol pseudopotentials 
from the PSlibary, I receive the error: 

Error in routine cdiaghg (797):
S matrix not positive definite
When I switch the diagonalization method to 'cg', the calculation converges as 
normal, however. Are there any settings I can try in order to use PBEsol with 
the Davidson diagonalization for the SCF? I have attached my input file.
Thank you for any potential help.

Attachment: input.pwi
Description: Binary data

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