Question I can't get all three monitors to work at the same time ?

[mnm313]

Hello friends,

I recently bought my 3rd monitor. But I couldn't manage to get all three of them to work at the same time. 2 monitors work but I have to disable the other one to activate the 3rd one. I can get images from all monitors but more than 2 are not active at the same time.

- I use AMD HD 6850 as a graphics card.
- My 2 monitors only have VGA inputs.
- My 1 monitor has VGA + DVI-D inputs.

I am trying to transfer from the graphics card as follows;
- Passive converter from DVI to VGA.
- Active converter from HDMI to VGA.
- Active converter from Display Port to VGA. (I am not sure if it is active but I will leave the sample image below)

I have been researching for days but I could not reach a conclusion. I am only considering the possibility that the DP to VGA adapter is not active. Thank you in advance for your help.

1st adapter: https://ibb.co/P6qYdSf
2nd adapter: https://ibb.co/TPQ1CzT
3rd adapter: https://ibb.co/SRc9P4s

 

[Glenwing]

This is expected since Radeon HD 6850 has the restriction as described here:

https://linustechtips.com/topic/729...v2/?section=active_adapters_for_multi_display

Except that the DisplayPort to VGA adapter should work since all DisplayPort to VGA adapters are active. Perhpaps internally it is designed as a DP to DVI passive adapter followed by a DVI to VGA active converter...

 

[mnm313]

This is expected since Radeon HD 6850 has the restriction as described here:

https://linustechtips.com/topic/729...v2/?section=active_adapters_for_multi_display

Except that the DisplayPort to VGA adapter should work since all DisplayPort to VGA adapters are active. Perhpaps internally it is designed as a DP to DVI passive adapter followed by a DVI to VGA active converter...

very solid guide, thanks for sharing.

If I understood it correctly, there should be no problems with my setup. As it says, I am using a display port > active vga converter for the 3rd monitor. In this case, all 3 monitors need to be able to display at the same time.

The only thing I can think of is changing the dp > vga adapter. I have the same suspicion as you said. Already have one of the same from a different brand, I will try that tomorrow.

At worst, I think I will buy an nvidia card with a display port output at the same levels with 6800 to get this working.