An imaginary second monitor called "No Monitor"

[AlbanRampon]

Hello,
What is the model of docking station you have from Cable Matters?
What is connected on the outputs? Is there any adapter left connected?
Head 1 is read and assigned.
Head 0 has a hotplug event detected so Windows assign a monitor to it. No ID can be read from plug so "no monitor" is assigned.

If you don't have any adapter connected on the dock, I recommend you disable the monitor in the Windows Display Panel (right click on desktop, then select screen resolution) instead of having it as "extend desktop to this display".

To address this completely, here is a longer way to remove the ghost. It requires you understanding what you are doing and poses risks if you delete the wrong things, your computer may not restart. That's why I advise disabling the monitor.
1. remove DisplayLink drivers
2. user the cleaner (precedure in my signature)
3. check in the registry that HKLM\Software\DisplayLink key and subkeys are moved.
3. check in the registry that HKCU\Software\DisplayLink key and subkeys are moved.
4. Delete Windows persistence as in http://support.displaylink.com/knowl...fy-numbers-are
5. Reboot
6. Install DisplayLink driver and rediscover monitors.

Kind regards,
Alban

[tferrin]

Hello Arampon,
Thank you very much for your input and troubleshooting steps.

The Docking Station has no exterior model number. On amazon it is referred to as "Cable Matters SuperSpeed USB 3.0 Universal Docking Station with 6-Port USB Hub, Gigabit Ethernet, HDMI/DVI Output and Audio Ports." Once I take it apart, I see Y-3705PCB1.0 on the mainboard inside. Please let me know if there are other module numbers I can provide.

There is no other adapters left connected, and in fact there is only one video out on the device-A single HDMI port.

I followed your steps for a clean reinstall of the display link device and I removed the windows persistence and registry keys as you suggested. Unfortunately, that did not remove the ghost monitor. I am able to disable the ghost monitor, but of course I would like to fix things if possible, rather than do a workaround. Please let me know if you have any more suggestions.

I have attached the most recent logs

Thanks!

[AlbanRampon]

Hello,

Thank you for trying and including new logs. I had a look at the new logs with a colleague.

What is taking place is that the docking station believes a monitor is connected (hotplug detection handled during the boot of the dock).
The dock tries to read the identification of the monitor (EDID) but fails. The docks sends our Windows driver it doesn't know what the monitor supports and the driver tells Windows it has a monitor of 1280x1024 to still display an image (as some monitors can be faulty or send corrupted EDIDs).
Even if there is only one HDMI plug cabled, our chip that Cable Matters added to their design can handle more.

The issue is therefore in the docking station itself which detects a monitor where there isn't. It could be from a soldering issue, or from any other production problem.

Kind regards,
Alban

[tferrin]

Hi Alban,
Thank you very much for your detailed explanation. It was very helpful and informative. I appreciate the time you spent looking this over and will take the issue up with the original seller and/or Cable Matters.