[growisofs and PX-716] impossible changing burning speed after the first burn.

[Stefano Vesa <stefanovesa@tiscali.it>]

I'm running Linux and using a Plextor PX-716A burner with 
dvd+rw-tools 6.1.
When I burn a capable 16x DVD ( as seen in the dvd+rw-mediainfo 
output) at a speed lower than 16x, e.g. 8x, then at the next burn 
the burning speed is fixed to the previous value, so I can't set 
16x anymore. To reset the drive I have to reboot the system.
Anyone has experienced the same?

Regards,
Stefano