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December 11th, 2025 11:01
18 Area-51 AA18250, AW3418DW, USB-C to DP, not seen on boot
I have trouble finding a reliable USB-C to DisplayPort cable. Using a goobay wired cable, got very bad flickering due to interference. I switched to a fibre optic cable, which solved the interference problem; however, the external monitor (Dell AW3418DW @ 3340 x 1440, 120Hz) with DP 1.2 was not recognised at boot. The only fix is to unplug the monitor and plug back in again. It is connected to the Thunderbolt 5 port on the Alienware 18 Area-51 AA18250 laptop (Windows 11 24H2). Wondered if anyone could recommend a, preferably wired, USB-C to DisplayPort cable which would not cause these problems?
Btw. Dell support did not recommend using an adaptor, and said to use a cable instead.
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PaulWilli
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December 11th, 2025 12:26
Use a high-quality certified USB-C to DisplayPort cable (DP 1.4, 3440×1440 @120Hz) and update GPU drivers; this prevents flickering and ensures the monitor is detected at boot.
zzwar
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3 Posts
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December 12th, 2025 03:27
Another external monitor user. Can you check out my post and verify your fans are much louder when hooked up to external displays?
I use the Dell usb c to DisplayPort that came with my optiplex pcs long time ago and they work fine no issues.
I run one 4K with usb c to display port using the Dell cable and one 4K using hdmi.