Only one monitor detected Win11 TBT4-UD5 connected to Thinkpad E16 Gen3 with Thunderbolt 4

Thunderbolt TBT4-UD5
1

Why my Lenovo Thinkpad E16 Gen3 (model 21SR007DUS with Intel Core 22U5, running Win11 25H2 with Thunderbolt4 support) when connected to a Plugable TBT4-UD5 recognizes only one external monitor?
Use conditions:

  • I have updated all drivers to latest versions as of 2/18/26

  • I am using the provided Plugable Thunderbol4 cable

  • Both monitors support HDMI

  • Both monitors work if connected individually

  • I can get both to work concurrently if one is connected directly to
    Thinkpad HDMI port and the other to TBT4-UD5 HDMI Port 1 (not on port 2)

  • I can even get the Thinkpad to support all three monitors (the built-in monitor plus two external) as long as one of the HDMI monitors is connected directly to the laptop.
    NOTE: In case this helps, I can get the “sleeping” laptop to get back to life by pressing the dock station power button. I CANNOT turn it on from shutdown state, though. If turning on from shutdown is supported, I’d like to know how to enable.

    #SecondMonitor #2ndMonitorSupport #TwoMonitor #2ndMonWontWork #2ndMonitordoesnotwork

2

Hello Luis,

Thank you for reaching out on the forums! I noticed that you also reached out to us directly over email, so I will be continuing communication there.

Thank you,

Evan
Plugable Technologies
www.plugable.com/support

3

Hi, I am having the same problem with my Dell 14 Plus 2-in-1 DB04250. I dock my laptop with both external monitors plugged into the HDMI ports. Only one of the Monitors works along with the laptop screen. If I plug one of the monitors into the laptop hdmi I can see all three monitors.

When the laptop is docked, I don’t care if I see the laptop screen. I really would like to see both external monitors.

4

Hello kimbered,

Thank you for the response, although I am sorry to hear that you are running into issues here also with your TBT4-UD5. Can you reach out to us directly at support@plugable.com so that we can help troubleshoot this email? Please be sure to reference Ticket #491374 in the subject line.

Thank you,

Evan
Plugable Technologies
www.plugable.com/support