1715S, two, DDM not working on second

Question

I bought two of these monitors last week because they fit side by side in my computer cabinet. I am trying to setup working from home. I cannot get the DDM (Dell Display Manager) to recognize the second monitor. Contacted the maker of the DDM software, and was told I have the wrong cable. One monitor currently uses VGA to VGA. Second is HDMI to VGA. He said that’s not right. I need 'HDMI-to-DisplayPort' adapter that works with DDM (i.e., supports DDC/CI). The computer is old, an Inspiron 660S, but runs fine for my needs as my company is completely cloud based. Any recommendations on where to find that cable that was recommended? Thanks for your help.

JoyceTX · Accepted Answer

Thank you. On the recommendation of our IT support person this is what I ordered. Do you have another recommendation by chance? Benfei gold plated HDMI to vga 6 foot cable male to male

DELL-Chris M · Answer

The service tag number that you provided to the DELL-Cares agent was for a S2316M monitor?

Does that Inspiron 660S have an add in video card? Or are you using the onboard VGA out port and HDMI out port?

A PC HDMI out port cannot upconvert to a monitor DP in port unless you get an active converter. The straight DP to HDMI cables are one direction =
PC DP out port --> DP to HDMI cable --> Monitor HDMI in port

It sounds like this is your physical setup. Please confirm.

PC VGA out port --> VGA to VGA cable --> #1 1715S VGA in port
PC HDMI out port --> HDMI to VGA cable --> #2 1715S VGA in port

In both 1715S, you opened the Menu- Other Settings and made sure that DDC/CI was set to Enable.

swamped207 · Answer

The problem will be that many HDMI-to-VGA converters break the bidirectional I2C support needed for DDC/CI and DDM.

swamped207 · Answer

Its is pricey, but have a look at Dell's own HDMI-to-VGA adapter here which explicitly claims support for Dell Display Manager (i.e., it supports DDC/CI).

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