Hi,

Just bought a P2720DC but not able to get daisy chaining to work properly.

Configuration:

• Lenovo ThinkPad E595
• Dell P2720DC Monitor
• Dell U2412M Monitor

The ThinkPad has a USB-C 3.1 Gen 1 port with DisplayPort support (source: https://psref.lenovo.com/syspool/Sys/PDF/ThinkPad/ThinkPad_E595/ThinkPad_E595_Spec.PDF). The specs don't mention the DisplayPort version or whether it has MST support, but I would assume so as the laptop is quite new.

I have connected the devices as follows:

• ThinkPad -> P2720DC (USB-C to USB-C) -> U2412M (DisplayPort Out to DisplayPort In)

For the P2720DC, I have set MST on by going to Menu -> Display -> MST -> On.

Problem: Only the P2720DC works. I don't get any image on the U2412M, instead it displays a message "There is no signal coming from your computer...". I have selected the DisplayPort input manually, but there is no image.

Curiously, if I connect my ThinkPad to a Lenovo ThinkPad USB-C Dock Gen 2, and the dock to the P2720DC using DisplayPort, daisy chaining suddenly works. Just to be clear, the following setup works:

• ThinkPad -> Dock (USB-C to USB-C) -> P2720DC (DisplayPort Out to DisplayPort In) -> U2412M (DisplayPort Out to DisplayPort In)

However, I don't want to use a dock so this setup is not sufficient for me. I'd like to get daisy chaining to work by using USB-C.

Any ideas what could be the problem? All help is greatly appreciated.

Best regards,
Niklas