this setting is visible in xvinfo but i'm using the nvidia-settings to check it and toggle ....
xvinfo (partial output):
Adaptor #1: "NV17 Video Texture"
"XV_SYNC_TO_VBLANK" (range 0 to 1)
client settable attribute
client gettable attribute (current value is 0)
Regarding patch - IMHO this should be a patch to Beryl - cause
a) this XV_SYNC_TO_VBLANK should remain on while not using composite manager
b) as mentioned in other thread currently there are some problems in beryl to fully respect
better to request a patch on Beryl/Compiz forum ...
PS: Already posted a bug for Beryl: