“Does this monitor support DP alt mode? My graphics card has DP 2.1, and I want to know if a unidirectional DP (Source) to USB-C (Display) cable will work.”
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Yes, the Dell S2725QC supports DisplayPort Alt Mode over USB‑C, however your proposed cable (DP → USB‑C Display) will not work. A DisplayPort output on your graphics card is not capable of generating USB‑C DP Alt Mode signaling. DP Alt Mode is not passive It requires: A USB‑C controller, USB‑C lane negotiation (CC pins, power role detection), A plain DP port cannot do this, even DP 2.1. Option A — Use HDMI 2.1 (Best for desktops). Option B — USB‑A + HDMI combo (if you want USB hub). Option C — Only if your GPU has native USB‑C.
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