ECDHE Ciphersuites not negociated by MariaDB

Hello.
During the TLS handshake, several clients present ECDHE ciphers during the "Hello client" step. However, the MariaDB server never seems to negotiate the ECDHE (Elliptic Curve Diffie-Hellman) ciphers, even if there is no restriction in the ssl-cipher parameter in [mysqld].
I have the impression that something must be wrong somewhere.

By the way, wouldn't it be a better choice to make MariaDB server choose his favorite cipher ? (see SSLHonorCipherOrder parameter, available in Apache) ?

Thanks