xorg from git: cannot regulate video params in Xv

[Pavel Troller]

Hi!
  I have a following problem in the current Xorg from git (master): I cannot
regulate contrast/brightness/saturation etc., when using Xv as a video output
driver. Typical application which doesn't work is mplayer. Whenever I try to
change those values, it draws its scale on the screen, but it's not moving
according to the desired action, it's just standing there: the contrast is
shown as minimal and the brightness as in the middle. Using -vo x11 mplayer
option, thus using the standard X11 output instead of Xv, makes the regulation
possible again, as well as using my backup Xorg installation (something as
7.1). It's using the intel video driver (also from git).
  Where the problem could be ? What to try ?

      With regards, Pavel Troller