no ptX device found

Hi all,

On current, till about 3 months, no pty device is created.
i see only a pts[0] in dev.
screen (4.0.1, not higher) does not find any pty device.
How can i create at least one?
my ttys seems to have no effect. I am pretty sure i miss somemthing.
In another hand, i see nothing in the man pages on this topic.

Thanks in advance for your help.

Best regards

Raoul
rmgls_at_free.fr