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Dell monitor blinking black4/5/2024 ![]() ![]() At other frequencies it would just flicker the bottom half of the monitor. At some refresh frequencies (Hz) the flicker was like a strobe light. ONLY that monitor would flicker, all other monitors including the laptop's internal screen would be fine. In this setup, the monitor connected to the HDMI cable would constantly flicker. As the tech support person mentioned, the HDMI port uses the special USB-C alternate mode which means it's driven by the Laptop's internal graphics card and something special in the dock that is NOT displaylink but a different technology. I have also connected the laptop to the dock via its USB-C connection, and two monitors via the displayport, and 3rd monitor using the dock's HDMI port. I had exactly the same problem you described, where the monitor connected to the HDMI port would flicker even though the monitor, cables and laptop were fine. I just wanted to say that I have a Dell D6000 dock, paired with my Dell Latitude 7490. Maybe other brands do not have the same USB-C problem, but using USB3 I solved my problem. I'm now using StarTech Docking Station with USB3 (no USB-C) since several months and it's running fine with 3x HP 27" screens.Īt the end all my "flickering" problem were related to ASUS hardware in relation with USB-C port (ASUS support told me that this notebook officially supports ONLY 1 external screen).
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