10-02-2018 03:14 AM
I received the quick update from development team that they observed the significant performance degradation with ThinkPad Hybrid USB-C Dock compared with system HDMI port.
On the other hand, they also found performance degradation rate was reduced when changing BIOS Setup's Graphics Device settings from "Hybrid Graphics" to "Discrete Graphics". Until the development team will find the solution, I'd like customer to change the BIOS Setup -> Display -> Graphics Device as "Discrete Graphics" temporally.
10-15-2018 12:39 AM
Yes it does, and its not a good solution. It dosent affect the performance at all. At least not that i can notice, maybe if you messaure it somehow. Performance on extermnal 4k monitor is still sluggish.. I get better performance in Sketchup on my old w530.. From 2012!!!
10-30-2018 01:16 AM
Sorry for long waiting. First, I need to appologize that we cannot provide the solution to you.
I'd like you to continue using discrete Gfx mode on BIOS to use external monitor via Hybrid USB-C Dock.
After development team investigated the issue, they concluded the this behavior is design limitation of the "DisplayLink USB Graphichs driver" which is used on ThinkPad USB3.0 Basic/Pro/Ultra Dock and Hybrid USB-C with USB-A Dock series.
When external display is connected through Hybrid USB-C dock, DisplayLink graphics driver is running to display grahics contents through USB3.0 bus but doesn't use DisplayPort signal on the USB-C port. Then, DisplayLink cannot recognize the nVIDIA Graphics device so that DisplayLink only uses Intel Grafphics device for all graphics contents.
When Discrete Graphics mode on BIOS, DisplayLink recognizes nVIDIA as primary graphics device so that Hybrid USB-C can shows higher perfromance graphics.
When user connect external display directly to USB-C/Thunderbolt port, moitor can use DisplayPort graphics feature and utilize full H/W graphics ability.
11-07-2018 11:33 AM
@cloudberry might also check refresh rate settings for your external monitor. On my x1y3 on first time external monitor connect it wasn't 60hz but 40hz or 30hz, so I had to change it up. Your values might be different.
11-08-2018 11:18 PM
Hello, thanks for the tip, but mine is set @60hz. Just checked it
To make matters worse, the dockingstation is freezing from time to time. So screen on external monitor freezes, internet is lost etc. I then have to open laptop lid to keep working, and save my stuff. Laptop does not freeze, only external monitor and docking station.
Then turn everything off, and it works again after that.. Extremely annoying, as this was very expensive for our company. We are only 2 people working in the office, and we both bought the same setup, have same problems too.