Issues detecting all monitors with a D6000, MacBook Air M2

[KatarzynaCzaja]

Hello,

The problem seems to be with Alt-mode technology.

The Dell D6000 relies on two USB graphics technologies to support up to three external displays.

DisplayLink and USB-C DisplayPort Alternate Mode, an optional USB-C port feature that requires connecting the docking station directly to a compatible host computer's USB-C port using the original USB-C cable provided with the docking station.

DP Alt-Mode is used with HDMI if the other two ports are occupied and DisplayLink is used with DisplayPorts if using 3 external monitors. If you use just two external monitors DisplayLink will handle them regardless of what ports they are connected to - this is why you see HDMI working if one monitor connected to DisplayPort is disconnected from the dock.

If three external monitors are connected DisplayLink will only handle the DisplayPorts and HDMI will not be seen by DisplayLink driver as it will use different technology than DisplayLink.

DP Alt-mode is not related to our technology. For it to work you have to have Dell D6000 connected via USB-C and your computer has to support DP Alt-Mode. If your computer does not support this technology - the HDMI port (when using all video ports), will not work.

If you are connected via USB-C and you are certain that the computer does support DP Alt-Mode then it is best to consult Dell directly.

[akipal]

My question is
Why it was working fine with M1 then not with M2?
With exact same setup, I was using all 3 monitors on my M1 then I upgraded with M2 which now working with only 2.
And i searched and there still is a similar product using DisplayLink then works with 3 monitors on M2 machines.

Originally Posted by KatarzynaKowalczyk

Hello,

The problem seems to be with Alt-mode technology.

The Dell D6000 relies on two USB graphics technologies to support up to three external displays.

DisplayLink and USB-C DisplayPort Alternate Mode, an optional USB-C port feature that requires connecting the docking station directly to a compatible host computer's USB-C port using the original USB-C cable provided with the docking station.

DP Alt-Mode is used with HDMI if the other two ports are occupied and DisplayLink is used with DisplayPorts if using 3 external monitors. If you use just two external monitors DisplayLink will handle them regardless of what ports they are connected to - this is why you see HDMI working if one monitor connected to DisplayPort is disconnected from the dock.

If three external monitors are connected DisplayLink will only handle the DisplayPorts and HDMI will not be seen by DisplayLink driver as it will use different technology than DisplayLink.

DP Alt-mode is not related to our technology. For it to work you have to have Dell D6000 connected via USB-C and your computer has to support DP Alt-Mode. If your computer does not support this technology - the HDMI port (when using all video ports), will not work.

If you are connected via USB-C and you are certain that the computer does support DP Alt-Mode then it is best to consult Dell directly.

[Quickie]

Hi,

Has there been a resolution to the following?
Its a common issue that after searching is related to your drivers.

The comment you made here confuses me as with no displaylink driver the HDMI works and display port does not

"If three external monitors are connected DisplayLink will only handle the DisplayPorts and HDMI will not be seen by DisplayLink driver as it will use different technology than DisplayLink"


M1 Macbook Pro works fine
Windows 11 laptop works fine

Dell won't answer these questions as they rely on you for the MAC software correct?

M2 Macbook Pro-HDMI to HDMI port not displaying?

Please advise?
Happy to pull logs for you to understand how this can be resolved

[jtcaron]

Model: MacBook Air M1
macOS: Monterey, stopped working since 12.6.2 (12.6.2, 12.6.3 and 13.2)
Dockstation: Dell D6000 (USB-C)
DisplayLink: 1.8

Only 2 out of 3 monitors are working.
Monitor 1: HP LP1965 - Works (DVI to DP)
Monitor 2: HP LP1965 - Works (DVI to DP)
Monitor 3: Asus TUF VG249Q - Not working (HDMI to HDMI)

[yarielrg]

Please any updates here!!

Model: MacBook Pro M2 Pro
macOS: Ventura 13.2
Dockstation: Dell D6000S (USB-C)
DisplayLink: 1.8

Only 2 out of 3 monitors are working.
Monitor 1: Lenovo L24Q-35 - Works via DisplayPort
Monitor 2: Lenovo L24Q-35 - Works via DisplayPort
Monitor 3: Lenovo L24Q-30 - Not working via HDMI

It works as mentioned before when I disconnect one from DisplayPort.

Also works perfectly well in my MacBook Pro M1 Max

[M2MacUser]

Same here..

• Model: MacBook Air M2
• macOS: Ventura (13.2)
• Dockstation: Dell D6000 (USB-C)
• DisplayLink: 1.8.0 buil 63.163

• Only 2 out of 3 monitors are working.
• Monitor 1: Dell U2412M - Works (DP to DP)
• Monitor 2: Dell U2412M - Works (DP to DP)
• Monitor 3: Dell U2412M - Not working (HDMI to DVI)

All other MacBooks, Dells, etc. are working. It's just the M2 that's not working.

Please check on it.

[markverg]

Unfortunately, I concur. I'm having the same issue as the issues described above; starting the M2 Air it doens't work anymore. Please advice.