06-11-2019 10:30 AM - edited 06-11-2019 12:07 PM
I have 3 monitors (Dell U2417H, 1920*1080) on a USB-C Dock, Gen 2. Two monitors are connected via Display Port, one via HDMI. My laptop is a T480. I set the power setting "Power buttons and lid" => "Lid close action" => "Plugged in" to "Do nothing" and closed the lid to deactivate the laptop display (because Intel Graphics only supports 3 monitors).
My problem is, that for the third monitor (connected via DP), Windows (10) only allows a maximum resolution of 1440*576, which results in no signal for this monitor.
I tried the third monitor in a setup with only two monitors, and then it worked as expected (so, it's not defect). Even in a setup with 2 monitors and the laptop screen, the monitors and the laptop screen work (so, it cannot be a max resolution restriction).
What could be wrong? What di I have to do to get the USB-C Dock running with 3 monitors?
I think I found the source of the problem. According to https://support.lenovo.com/ie/en/solutions/pd029622 the USB-C Dock only supports 3 monitors with 1920*1080 if the laptop (!) supports DP 1.4. Unfortunately this is obviously not the case for the T480. For laptops only supporting DP 1.2, only two monitors with 1920*1080 are supported, or three with 1024x768.
07-02-2019 11:31 PM
Thanks for the reply, did not know that. I now use the ThinkPad Pro Docking Station that works well with 3 HD monitors. I was just disappointed that the USB-C Dock does not, and when you buy it, it's not made clear.