Vostro 3470, problem with HDMI?

So, I have the monitor with integrated sound. If it connect by VGA and jack - it works correctly. I have 1080х1920, 32 bit color and sound.

But if it connect by HDMI (in this time vga & jack are turned off) - thare are no sound at all and video only 8 bit color (the picture is terrible). I installed latest GPU drivers from Intell 630, but no result.

The HDMI-cable is okey, because I use it to connect the same monitor to notebook - all works correctly (video, sound). Sorry for my english. Thanks.