FC6 and ATI breaks mplayer xv

[William Murray]

  Hello all,
            I have a laptop with ATI X300 and FC6. The xorg.conf is
minimal, but requests the fgl driver from livna.

I get an error in Xorg.0.log:
(EE) AIGLX: Screen 0 is not DRI capable
But that seems to me well known.

  However, I also have no 3D graphics or xv in mplayer. These were fine
with FC5.

e.g. fglf_glxgears gives:
Using GLX_SGIX_pbuffer
X Error of failed request:  GLXUnsupportedPrivateRequest
  Major opcode of failed request:  143 (GLX)
  Minor opcode of failed request:  16 (X_GLXVendorPrivate)
  Serial number of failed request:  27
  Current serial number in output stream:  29

  Can anyone suggest how to debug? 
    Thank you,
            Bill