sqwirk
1 Copper

OptiPlex 3040 micro, dual monitors using HDMI and DP ports, DP connection unreliable

Hi there,

I've got an OptiPlex 3040 micro running Windows 10 64bit (came installed on the machine) and two monitors (Dell U2415, came as a pair) using extended display. One monitor has an HDMI-HDMI cable going into the computer's HDMI port, the other has a DisplayPort-DisplayPort cable going into the computer's DisplayPort port. (There is no VGA port installed on this machine)

Both monitors are on the correct setting for detecting what cable is plugged into them. Whichever monitor the DisplayPort cable is plugged into cuts out to a black screen with nothing on it multiple times an hour during normal computing (mostly email and web browsing). Not a steady flicker, just randomly goes black and randomly comes back on.

I uninstalled and reinstalled the drivers for the monitors, checked all the settings, ran the troubleshooter (no issues found), updated my graphics card driver (it was already the latest version), and nothing seems to be wrong there.

When I swapped the HDMI and DP cables to see if it was a cable issue or the physical monitor, the monitor that then had the DP cable plugged into it started to have the problem, whereas the other monitor (now plugged in via HDMI) had no problems. Originally there was a Mini DP-DP cable connecting one of the monitors and I thought maybe that was the issue, so I replaced it with a brand new DP-DP cable the other day. Still having issues with whichever monitor is connected via DP.

This computer is not even three months old. The physical cables aren't the issue and the physical monitors aren't the issue. Is there anything I can do to have the OptiPlex 3040 micro be able to have two Dell U2415 monitors simultaneously connected via Display Port and HDMI and have them work appropriately? 


Thanks in advance! I've looked at other posts on here and on Windows' support forums but haven't found anything that works yet. Beginning to think the OptiPlex can't handle two monitors.

0 Kudos
21 Replies
Moderator
Moderator

RE: OptiPlex 3040 micro, dual monitors using HDMI and DP ports, DP connection unreliable

This does not sound like a hardware failure. Did you check/test all of the Windows 10 power management options? Specifically the PCI Express- Link State Power Management setting? Or just set the Windows 10 power management to High performance and retest. Also, if the U2415s USB upstream cables are connected to the computer, be sure to disable the USB selective suspend setting.

0 Kudos
Highlighted
Mark Cary1
1 Copper

RE: OptiPlex 3040 micro, dual monitors using HDMI and DP ports, DP connection unreliable

Display issue here, too.

We have a monitor plugged into the HDMI, using an HDMI to standard video adapter and DP to DVI cable hooking the other monitor in.

If that is supposed to work, it does not.

What are the recommended hookup scenarios that are 100% supported by this 3040 Micro?

bradworkduc
1 Copper

RE: OptiPlex 3040 micro, dual monitors using HDMI and DP ports, DP connection unreliable

I am having issues with new 3040 Micro's as well with the display going black and never coming back.  Updated all drivers and BIOS.  Not a monitor or cable issue, works fine on other models.  I end up remotely rebooting and sometimes even that the display doesn't come back until 2-3 reboots.  I don't get a Dell logo when it starts up sometimes, so its happening before Windows is loaded.

k9gardner
1 Copper

RE: OptiPlex 3040 micro, dual monitors using HDMI and DP ports, DP connection unreliable

I need to know the answer to this as well, Chris, and it would be particularly helpful to know that Dell does in fact intend that these computers support 2 monitors out of the box, and what the recommended cabling and settings are. I don't see ANY instructions available on this and since this is my first Dell that does not have a VGA connector to fall back on, this really has to work or I've got to return it. Hope to see an authoritative and conclusive post here.


[Edit:] I just looked up "Features and Design" of the Optiplex 3040 and here's something I found:

Small Form Factor Ports & Slots:
6.Natively supports 1 digital video output ( DP and HDMI ) | 7.Optional VGA

and Mini Tower Ports & Slots:
6.Natively supports 2 digital video outputs (DP and HDMI) | 7. Optional VGA

Am I reading this right? That the SFF is not in fact designed to support 2 video outputs? I'm not going to verbalize the comments that are going through my head, I just hope to get the correct answer here. 

Thanks.

Thanks.

rbennett87
1 Copper

RE: OptiPlex 3040 micro, dual monitors using HDMI and DP ports, DP connection unreliable

I've been trying to get a small form factor to work with 2 displays innately (without a usb video adapter) for the past few days now and nothing I've tried has worked, I had a fellow tech tell me he got it to work but he has not been able to reproduce it.

I can't tell you how frustrating this has been, why on earth would any computer shipping in the year 2016 not support 2 monitors innately ?

"Am I reading this right? That the SFF is not in fact designed to support 2 video outputs? I'm not going to verbalize the comments that are going through my head, I just hope to get the correct answer here. "

I  Just registered my account to agree with you k9gardner.

If any Dell representatives would like to give us an official answer, it would be very much appreciated.

0 Kudos
KnuteReam
1 Copper

RE: OptiPlex 3040 micro, dual monitors using HDMI and DP ports, DP connection unreliable

I've been looking closely at the Optiplex 3040 small form factor for a rollout we've got coming up, and we're very interested in the dual monitor capability.  I have not tested it yet, but the rep we're working with suggested using MST (multistreaming) capable monitors (like the U2415) to drive two monitors from a single DP port on the computer; that is a specifically supported configuration.

0 Kudos
zerox321
1 Copper

RE: OptiPlex 3040 micro, dual monitors using HDMI and DP ports, DP connection unreliable

I like to know if it is possible to use 2 screens with the SFF model.

0 Kudos
ts3
1 Copper

RE: OptiPlex 3040 micro, dual monitors using HDMI and DP ports, DP connection unreliable

Turn off Display Port 1.2 on your monitor using the DisplayPort cable.

0 Kudos
zerox321
1 Copper

RE: OptiPlex 3040 micro, dual monitors using HDMI and DP ports, DP connection unreliable

I can confirm that the SFF model supports 2 screens(when using a HDMI->DVI adapter and a DISPLAYPORT->DVI adapter . It was all working out of the box.

So the text on the site is wrong!

Small Form Factor Ports & Slots:

6.Natively supports 1 digital video output ( DP and HDMI ) | 7.Optional VGA

0 Kudos