(In reply to Pitscho from comment #20)
> I've read a lot about tvrgb here, what is about YCbCr. My Tv for example
> produces a better picture with this space compared to limited RGB.

If you set your TV to use YUV and set output_csc to ycbcr601 or ycbcr709, it
may work.  Depending on your display, you may also have to adjust the hdmi
packets the driver sends.