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  • Is the dock connected to the Thunderbolt 3 port? Commented Mar 4 at 22:31
  • Yes, it is. I'm trying to operate the two displays via dock.
    – jotess
    Commented Mar 5 at 6:46
  • This is quite likely a bandwidth issue still. Check that the thunderbolt cable is actually the right one, and supporting that bandwidth too. 8K is a really large area, and HDMI and DP uses different connection methods thus DP works slightly better.
    – LPChip
    Commented Mar 5 at 9:08
  • Yes, quite likely a bandwidth issue. I checked the cable, it's one of the two types Lenovo specifies.
    – jotess
    Commented Mar 5 at 18:16