I was troubleshooting a tearing problem when using flash 10 under Puppy Linux Quirky, under the following setup

xorg-server 1.7.6
Nvidia 280.3
10.3.181.34
tested w/ hardware acceleration on/off,

~/.xinitrc additions
nvidia-settings -l
export XV_SYNC_TO_VBLANK=1
export __GL_SYNC_TO_VBLANK=1


and the following xorg.conf changes
Option "TripleBuffer" "1" #also tested with 0
Section "Extensions"
Option "Composite" "Disable"
EndSection


We also tested under mplayer using -vo xv, same result.

Thank you