Hi,
I have an R9 270X card, and I have plugged into it (1) hdmi -> hdmi, (2) dvi -> hdmi, (3) mini-displayport -> dvi.
On Windows 10, using the most up-to-date drivers (i updated them today), it will only let me use (1) and (2) OR (2) and (3) at the same time (I haven't tried other combos since (2) is my "main" monitor).
On Ubuntu (18.04), which I dual-boot to, there are absolutely no problems using all 3 monitors at the same time.
Why is this? Can I fix it? Any help/solutions appreciated.
Cheers