XVideo and XFree86 4.0.3

[Petrov M.I.]

Hi All.  
Does S3 Trio3D/2X card support XVideo for XFree86 4.0.3 ?
X loads the XVideo extension:
 (II) Loading extension XVideo in /var/log/XFree86.0.log.
I try `xvinfo` :
 X-Video Extension version 2.2
 screen #0
  no adaptors present
If X support Xv, how can I force it to work?                                    
    
Bye.