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- HP Community
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- 3rd monitor issue

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01-16-2023 03:52 PM
I currently have 2 additional monitors connected, ( 1 - 24' HP & 1 Duex portable both working) I wanted to swap the Duex (13.3in screen) for another 24" HP. My laptop will not detect the 2nd HP monitor.
Things I've tried:
- Connecting the HP monitors to a splitter plugged into one HDMI port
- Connecting the second HP monitor with an HDMI adapter (HDMI to USB).
- Run thru each of the standard steps to resolve the problem
- Updated drivers
- Tested each monitor and they work correctly
- Tested each port and they work correctly.
I am out of ideas.
Please help..............
01-16-2023 05:18 PM
The specs of your computer is
https://support.hp.com/au-en/document/c06473746
How did you connect them before ? What is the model/product of your Durex monitor ?
Regards.
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01-16-2023 07:09 PM
I can't locate the Duex monitor product/model number. The 24" HP monitor is plugged into the HDMI port and the Duex is plugged into a USB port. I got it from Amazon - it works great. My problem is that I want to replace the Duex with another 24" HP monitor, but the laptop won't detect it. I have tried all the recommended steps, but have not been successful.
01-17-2023 11:22 AM
I don't know the Durex, it may have buit-in part. But for the second HP you need a DisplayLink Certified adapter such as
Regards.
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02-05-2023 05:01 AM
Similarly, my specs are below.
HP Elietebook 840 G7
Windows 10
HP G7 dock
I have 3 match FD monitors connected to my G7 dock and 1 monitor always seems to jitter. I’ve tried swapping around the connection type, updated the drivers and enable USB-C DP in the bios with no change. If I disconnect a monitor with now jittering, the remains 2 display perfectly fine at 1920x1080.
The only setting that seems to work is changing 1 monitor to a 640x480 resolution. Any suggestions on how I can have all 3 display at 1920x1080 without the jittering?
02-05-2023 01:07 PM
What is your HP G7 dock ? I can't find it on the following list
https://www.hp.com/au-en/shop/accessories/docks.html
The ROT is total resolution go up refresh rate will go down. You may get the third monitor at 1920 x 1080 wen reduce its refresh rate to 30Hz or lower.
Regards
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02-05-2023 06:41 PM
Yes sorry… I have a G5 dock. The best result I could achieve with no jittering of the 3rd monitor going from left to right is:
1920x1080
59.94 hz interlaced
DisplayPort
1920x1080
59.94 hz
DisplayPort
720x576
50 hz interlaced - no option to adjust refresh rate
HDMI
I thought about purchasing brand new cables to see if they are causing the issue. The hdmi is 4k but I’m not sure about the DisplayPort cables.
02-05-2023 09:22 PM
I'm using HP USB-C G5 dock now. I tested the dock on 3 machines
My equipment
Notebooks
- HP Elitebook 840 G5 with Thunderbolt™ 3 port - PSU 65W
- HP Omen 15-dc0071tx with Thunderbolt™ 3 port - PSU 200W
- Dell Inspiron 2-in-1 13-7000 series with Thunderbolt™ 3 port - PSU 65W
- HP Envy x360 15-ee0047nr with USB-C 10Gbps with PD and DP 1.4 - PSU 65W (this machine is a gift from HP forum 2 years ago)
Monitors : I've got 5 monitors they are all FHD (1920 x 1080) and at least 5 years old I used 3 monitors for my tests
- Asus 24" which has HDMI (2) and VGA inputs
- Dell 22" which has DVI and VGA inputs
- LG 24" which has HDMI, DVI and VGA inputs
Cables
I did not buy new cables, using existing cables around the house
- 2 cables (DP to HDMI) direct from the dock to Asus and LG monitors
- 1 cable (HDMI to DVI) direct from the dock to the Dell monitor
Results:
Moniotors: all 3 monitors worked + notebook monitor
Charge: Except for the HP Omen, the dock charged other 3 machines
One cable solution: Except for the HP Omen, the dock worked on other 3 machines
- power the dock also power the machine, no need to lift the lid.
- shut down machine also turn off the dock for the HP 840 only.
Again, I did not test the RJ-45 port on the dock, also mice and keyboards because do not have wired mice and keyboards to test.
Back to your situation, the difference: my machine is G5 and your machine is G7. I don't know why.
Regards.
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