This thread from Tom's Hardware might explain why your HDMI doesn't work in Eyefinity: HD6950 only 2 monitors at a time - [Solved] - Displays
BEST ANSWERDec 10, 2012, 1:03 AMYou cannot hook up 3 monitors to eyefinity without using display port. The HDMI and single link DVI port share the same single and cannot be used at the same time.
Another thread concerning 3 monitors on HD 6970: 3 monitor setup on 6970 - [Solved] - Displays - Tom's Hardware
In the graphics card, there are normally two DVI ports. One of the DVI ports is the DVI-S which shares the clock with the HDMI port & only one of them can work at the same time. Perhaps you used this DVI-S port.
Try to connect your 21" to the "other" DVI port.
Another thread concerning HD 6970 with three monitors: Three Monitor Setup on a Radeon 6970. | guru3D Forums
ok, was just making sure, as far as i know you cant use the HDMI and the 2 DVI's because one of the DVI's is on the same link as the HDMI.
Why the DP-DVI adapter doesnt work with the 2 other DVI's im really not sure, heres a list of the recommended adapters - http://support.amd.com/us/eyefinity/Pages/eyefinity-dongles.aspx
You cant go above 1920x1200 resolution on 1 screen with a passive adapter but theyre a lot cheaper.
Im using 2 DVI's and an active adapter for the DP->DVI without any issue( just pointing out that its pretty much the same as yours apart from the adapter ).
Can you try it like this:
if that doesnt work
swap the DVI to user the other DVI
You could be connecting the DVI & HDMI that use the same link so swapping to the other DVI should work.
What resolutions are each monitor set for?
How to setup and configure Eyefinity: Setting Up and Configuring Multiple Displays to Run in AMD Eyefinity Mode
Here is Eyefinity FAQ page: AMD Eyefinity™ Technology - Frequently Asked Questions (FAQs)
From AMD Support on the HD 6970 Spec: AMD Radeon™ HD 6970 Graphics
CUTTING-EDGE INTEGRATED DISPLAY SUPPORT
- DisplayPort 1.2
- Max resolution: 2560x1600 per display
- Multi-Stream Transport
- 21.6 Gbps bandwidth
- High bit-rate audio
- HDMI® (With 3D, Deep Color and x.v.Color™)
- Max resolution: 1920x1200
- Dual-link DVI with HDCP
- Max resolution: 2560x1600
- Max resolution: 2048x1536
- DisplayPort 1.2