Lenovo ThinkPad Thunderbolt 3 Workstation Dock Gen 2 User Manual page 14

Some computers do not support the Certified Output Protection Protocol (COPP), and you cannot play
back the protected videos on the external monitor connected to the dock.
To play back videos on the external monitor, you can connect the external monitor to the VGA or
DisplayPort connector on your computer, and configure the display settings of your preference. See
"Configure the external displays" on page 8.
3. The images on the external monitor flutter.
Check the display resolution of the external displays and ensure that the resolution is supported by the
dock.
4. The computer can play back Web flashes. However, when you drag the window to the external
monitor and maximize the playback window, the playback stops.
Update your Adobe Flash Player program to the latest version.
Audio
By default, the audio connector on the computer is disabled automatically.
To enable the audio connector on your computer, see "Use the audio connector" on page 7 for more
information.
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ThinkPad Thunderbolt 3 Workstation Dock Gen 2User Guide