On systems with KabyLake (KBL) processors, when you connect a Dell Docking Station TB16 / TB18DC / WD19TB / WD19DC / WD19TBS / WD19DCS to a monitor using the HDMI port, the monitor may display garbled characters randomly on the left of the Dell splash screen within 2 s when system resumes from an S4/S5 power state.
The issue is related to a Dynamic CD clock implementation change that causes the issue.
Workaround: You can work around the issue by unplugging then reconnecting either the TB16 / TB18DC / WD19TB / WD19DC / WD19TBS / WD19DCS USB Type-C connection to the system, or the HDMI monitor cable connection to the TB16 / TB18DC / WD19TB / WD19DC / WD19TBS / WD19DCS dock.
You can resolve this issue by updating the system BIOS to the most current version available from Dell Support/Drivers & Downloads. Make sure your system model and operating system are correct, choose BIOS from the Category drop-down menu, and download and install the latest available BIOS update that appears.