Xgl error

[Rutka Patrick]

Hi,

I've got a problem when launching Xgl.

It works perfectly from a 26/02/2005 cvs (Xserver and Cairo) before I upgrade 
to Xorg 6.8.2(Mandrake).  Now I've got this message with a uptodate cvs :

/opt/fdo/bin/Xglx :1 -ac -screen 640x480
Visual: 0x0 (y) - r/g/b/a: 8/8/8/8  db: 1
Initialized 640x480 back buffer offscreen area
Initialized 2048x2048 pbuffer offscreen area
Initialized 2048x2048 pbuffer offscreen area
X Error of failed request:  BadLength (poly request too large or internal Xlib 
length error)
  Major opcode of failed request:  27 (X_UngrabPointer)
  Serial number of failed request:  84
  Current serial number in output stream:  87

what is this problem ? 

Thanks,

Ps : with nvidia driver