Here is my hw spec and some details from previus post
Looks like that I we had similar problems.
I've been bugging manufacturer via email and first I've been told by an engineer that I must have EXACTLY the same monitors for triple configuration.
Testing that statement in Win7 confirmed that I can't use passive HDMI-DVI adapters and can be different monitors but same resolution (different resolution introduces flickering).
OK, there is also a LVDS support, so I had to ask is this motherboard any special from referent design... And another engineer replies:
1. Use Ivy Bridge CPU
2. 2 HDMI + DVI / 2 HDMI + VGA / 2 HDMI + LVDS
3. Must have driver support
HDMI is a transfer from DP port of Intel PCH
Tested today Ubuntu 13.04. Everything works out-of-the-box. Even passive HDMI-DVI adapters.
OK... Almost everything... HDMI audio is broken (just in Ubuntu's kernel... that unity icon clockwise swirly thingy is more important than kernel bugs... Nice touch )
Tomorrow I will test different monitors and TVs to see is there some limitations.